How to Paint a Boat in 9 Steps
At a glance
Wash and degrease the hull, dewax it, repair and sand it smooth, prime, then roll and tip thin coats of marine paint. Follow the paint maker's data sheet for sanding, recoat and cure times. Most of the final look comes from prep.
- Wax and silicone residue can cause fisheyes, bubbling and poor adhesion, so dewax before sanding.
- Use a primer and paint made to work together, and follow the data sheet.
- Hard to the touch is not fully cured, so wait for the full cure time before launching.
The right tool for this job
Marine Degreaser Black Streak Remover
Cut black streaks, grease, grime, oil stains, and scum from boats. Works on fiberglass, gelcoat, stainless steel, and more. Use it when ordinary soap is not touching the grime.
View productContents (15 sections)
- Can You Paint a Boat Yourself?
- How to Paint a Boat Hull
- How to Repaint a Boat
- What Kind of Paint to Use on a Boat
- Is It Cheaper to Paint or Wrap a Boat?
- 1. Set Up
- 2. Protect Yourself
- 3. Prepare the Surface
- 4. Sand
- 5. Apply Primer
- 6. Apply Topside Paint
- 7. Dry & Sand
- 8. Apply Final Coat
- 9. Enjoy the Ride
- Frequently Asked Questions
To paint a boat, wash and degrease the surface, dewax it, repair and sand it smooth, apply a compatible primer, then roll and tip thin coats of marine paint, following the paint maker's data sheet for sanding, recoat and cure times. Most of the work, and most of the final look, comes from the prep. This guide covers the steps, the right paint for each surface, whether sanding is really needed, and how painting compares with a wrap.
Boats lead a rough life. They bake in the sun, get rained on, float in salt or fresh water, and collect plants and sea life on the hull. They chafe against docks, scrape on trailers and skid up onto beaches. Some boats eventually need paint because of coating failure, repairs or the finish the owner wants, whether that means patching small areas or repainting the whole hull.
Here are nine steps to make the job go smoothly.
Can You Paint a Boat Yourself?
Yes. A careful owner with basic tools can repaint a small to mid-size boat in a driveway, barn or shop. The work is not hard, but it is slow, and rushing the prep or the curing time is what ruins most DIY paint jobs. Larger hulls, spray finishes, two part coatings with strict safety requirements and high-gloss yacht work take more equipment and a controlled space. Those jobs are often worth pricing out with a professional. For hull repairs before painting, see this guide to repairing boat hull damage.
How to Paint a Boat Hull
Painting a boat hull follows the same order every time. Clean and degrease the hull, dewax it, repair dings and gouges, sand to the finish the coating maker specifies, prime, then apply thin topcoats with a roller and brush. Each stage is covered in the nine steps below. Use a primer and paint made to work together, and check the data sheet for conditions, recoat windows and the cure time before the hull goes in the water.
The coating stack, top to bottom
Work goes from the bottom layer up.
How to Repaint a Boat
Repainting starts with finding out what is on the boat now. Paint that is sound and well bonded can often be cleaned, dewaxed and scuffed, then recoated with a compatible system. Paint that is peeling, blistered, flaking or of unknown type may need to be removed back to a sound surface first. Whether new paint will bond over the old coating depends on both products, so check the new paint maker's instructions for compatibility, any required primer or tie coat, and the preparation they call for. Then follow the steps below.
What shape is the old paint in?
Sound and well bonded
Can often be cleaned, dewaxed and scuffed, then recoated with a compatible system
Peeling, blistered, flaking or unknown
May need to be removed back to a sound surface first
What Kind of Paint to Use on a Boat
The right paint depends on the surface and on where the boat spends its time. Better Boat does not sell paint, so buy it from a marine paint maker and follow the product's data sheet for primers, thinners, dewaxing, recoat windows and cure times. Always use a primer and paint made to work together.
| Surface or use | Common paint choice | Notes |
|---|---|---|
| Fiberglass topsides and hull above the waterline | Marine polyurethane (one part or two part) or marine enamel | Two part polyurethane is generally more durable but is harder to work with. One part paints are friendlier for beginners. |
| Hull bottom on a boat kept in the water | Antifouling bottom paint | Use a primer compatible with the bottom paint. Check local rules on antifouling paints. |
| Aluminum boats and pontoons | Primer made for bare aluminum, then marine paint | Do not use an antifouling paint on aluminum unless its manufacturer clearly labels it for aluminum and names the required primer or barrier system. Conventional copper based coatings can cause galvanic corrosion. See this guide to aluminum boat bottom paint. |
| Wood boats | Marine primer system with marine enamel or polyurethane | Seal bare wood and fill seams with a filler made for marine use. |
| Walkways and decks | Non skid deck paint | Choose paint made for foot traffic rather than a smooth hull paint. |
If the gelcoat is only dull or chalky and not damaged, paint may not be needed. Compounding and polishing can bring back the gloss. See the best boat polish for oxidation. Painting over gelcoat is also covered in this gel coat painting guide, and a related walkthrough is painting a boat hull.
Is It Cheaper to Paint or Wrap a Boat?
Costs vary a lot with boat size, hull condition, the paint system and labor, so get written quotes for both before deciding. Doing the work yourself usually costs less than hiring a yard, since the main expense becomes materials and your time. A wrap covers the surface instead of refinishing it, so it does not fix damaged gelcoat, and edges, curves and hardware can limit where it works. Paint can be sanded, touched up and recoated, and it is the normal choice for a hull that sits in the water.
1. Set Up
Gather your painting supplies and prep the area and the boat, just as you would for painting a house or an antique car. Painters often say that most of a good paint job is decided in the preparation phase, so give this step real time.
Better Boat pick
Instant Boat Hull Cleaner
Attack waterline stains, rust stains, exhaust marks, algae stains, and scum before they make the hull look neglected.
View productStart by washing the hull with water and boat soap and a scrub brush or pad to remove dirt and grime. If the boat has been in salt water, rinse it thoroughly, because salt left on the surface can interfere with paint adhesion.
Waterline stains, rust marks and exhaust streaks should come off before sanding, or the sander will grind them into the surface. Instant Boat Hull Cleaner is made for fiberglass and painted hulls. Apply it, wait, then rinse. For oil, grease and black streaks, the Marine Degreaser Black Streak Remover cuts through grime that soap leaves behind. Rinse well and let the hull dry. For more on cleaning a hull, see how to clean a boat hull.
Washing is not the same as dewaxing. Wax and silicone residue can cause fisheyes, bubbling and poor adhesion, so after washing, use the dewaxer or surface-preparation solvent that the paint maker specifies, and wipe with clean rags that are changed often. Do this before sanding so the sander does not push wax into the surface.
Once the boat is clean and dry, sweep and vacuum the work area to keep dust down. Do not spray water around the hull while the surface is being prepared or painted. Dampening a floor to hold dust is only appropriate if the coating instructions allow it, and only if it does not wet the hull or push the conditions past the temperature and humidity limits on the label.
2. Protect Yourself
Wear gloves. Nobody wants to peel paint and epoxy off their hands for weeks. Use chemical resistant gloves, and check the paint label and safety data sheet, since solvents can break down thin latex gloves.
Before you open the paint
- Wear chemical resistant gloves
- Check the label and safety data sheet for the right respirator
- Avoid breathing sanding dust and solvent fumes
- Hire a professional if the label calls for supplied air protection
- Dispose of paint, solvents and rags by local rules
Protect your lungs. Avoid breathing sanding dust, paint fumes and solvent fumes. A basic dust mask is not enough for fumes. Follow the product label and safety data sheet for the right respirator and cartridge type, fit testing, ventilation and any other protective gear. Some two part coatings and most spray applications call for professional controls or supplied-air protection, so do not guess. If the label calls for that level of protection, hire a professional.
Read the paint can's warnings, and dispose of paint, solvents and rags according to the label and your local rules.
3. Prepare the Surface
Now fix the dips, dents and gouges in the hull. Choose fillers and primers that work with the paint you have picked, since not every filler is compatible with every paint. Two part epoxy fillers are a common choice for fiberglass, aluminum and wood.
Surface prep checklist
- Wash with boat soap and rinse off all salt
- Remove waterline stains, rust marks and exhaust streaks
- Degrease and dewax with the paint maker's solvent
- Fill dips, dents and gouges with a compatible filler
- Let the filler cure fully, then sand
- Check smoothness by hand and add filler where needed
- Vacuum dust from the hull and work area
Mixing ratios, mixing method, working time and cure time vary widely from one filler to the next. Measure, mix and apply the filler exactly as its technical data sheet directs, and mix thoroughly, because poorly blended material may not cure properly.
Fillers and sealers made for marine use come from several paint makers. Pick one made for the job, check that it works with your primer and topcoat, and read the data sheet for the recoat time.
4. Sand
Once the dips and dents are filled, let the filler cure fully. When it is hard, it is time to sand.
On a wood boat, sand with the grain, never against it.
The goal is to give the surface the profile the coating needs and level the filler. A random-orbit sander works well for this and saves a lot of time. Use the exact grit and surface profile specified by the filler, the surface-preparation guide and the primer manufacturer. Sanding too coarse leaves scratches that show through, and sanding too fine can weaken adhesion, so do not rely on a generic number. If stains or discoloration remain, clean or assess them first rather than sanding harder, since sanding only grinds them in.
When you finish sanding, run your hand along the hull and feel for dips and grooves. You can also hold a thin batten along the hull to double-check that it is smooth.
Before primer goes on
- Filler is fully cured and sanded level
- Grit and profile match the filler and primer data sheets
- Hand run along the hull finds no dips or grooves
- A thin batten held along the hull sits flat
- Stains are cleaned or assessed, not sanded harder
- Old bottom paint is identified and its data sheet read
Add more filler where needed and sand again, using a longboard sander on larger flat areas and the grit your data sheets call for. It is slow work, but any flaw at this stage will look worse once the paint is on.
Do You Need to Sand Before Painting?
Usually some surface preparation is required, but how much depends on the paint system. Glossy gelcoat, old paint and fresh filler generally need to be sanded or otherwise prepared to the profile the primer calls for, and skipping that is a common reason paint peels or fails. Some primers are made to bond with limited sanding, and some compatible recoats need only cleaning, so read the label of the new coating.
Preparing Old Bottom Paint
Preparation of the bottom depends on the existing coating, its condition and whether it is compatible with the new system. Some bottom paints can be recoated after cleaning, while others call for removal, a tie coat or different preparation, so follow the instructions from both the old and new paint makers. Old antifouling paint can contain biocides such as copper, and the dust is hazardous. First identify the existing coating, then read its safety data sheet and the instructions for the new paint. Whenever sanding or removal is specified, avoid uncontrolled dry sanding, use the respirator and other protective gear the labels specify, contain the dust and debris, and follow marina and local rules for removal and disposal. Many yards restrict where and how bottom paint can be sanded, so ask before starting.
5. Apply Primer
Now that the hull is smooth, it is time to prime. Make sure the hull is clean, dry and free of dust, small hairs and debris. Vacuum the work area beforehand to keep dust out of the air, and keep the hull dry. Then apply the undercoat.
Apply Undercoat
The undercoat should be compatible with the paint you are using.
Tip. As a rule, two part paints are more durable than single part paints, but they can be harder for DIY beginners to work with.
Roll or brush the undercoat onto the hull.
Tip. Use an undercoat or primer close to the color of the topside paint, especially when painting over a dark hull. Then relax in your chair and let it dry as the label directs.
Sand Again
Yes, more sanding. Use the grit the primer and paint data sheets call for. Check the smoothness again, and if you find dips or holes, add filler or a second undercoat. The smoother the surface, the better the shine.
Tip. To avoid an orange peel finish, wipe the hull with the solvent the paint maker recommends to remove oils from fingertips and hands.
Now you are ready to apply your topside paint.
6. Apply Topside Paint
Before painting, put down drop cloths and mask every area you do not intend to paint.
Check the conditions. Every marine paint has its own limits for air and surface temperature, humidity and dew point, so follow the product's stated limits on the can or data sheet.
Stir or mix the paint the way the paint maker directs. An Epoxy and Paint Mixer is a helical drill attachment that fits electric drills with 3/8 inch and larger chucks and is made for mixing epoxy resin, paint and other thick liquids in cups, quart cans or gallon containers. Skip a drill mixer if the product instructions prohibit it, and run it slowly so it does not whip air into the material.
A common method for rolling a boat is called rolling and tipping, when the coating instructions permit it. Roll the paint on, then go back over it lightly with a brush, brushing in one direction only. Use the roller cover and brush type the paint maker specifies, because the wrong roller material can soften, shed or affect the finish. Apply thin coats.
Tip. When painting the bottom of a pontoon boat, use only an antifouling paint that its manufacturer labels for aluminum. See aluminum boat bottom paint.
7. Dry & Sand
Yes, more sanding. A deep, long lasting shine takes time. Follow the data sheet for your paint system for the sanding interval between coats, the minimum and maximum recoat windows, and the number of coats. Waiting too long can push a coating outside its recoat window, so do not guess.
From primer to launch
- PrimeApply an undercoat that works with your paint
- Sand againUse the grit the primer and paint data sheets call for
- Topside paintRoll and tip thin coats, then let each coat dry
- Sand between coatsFollow the data sheet recoat window
- Final coatApply it the same way as the earlier coats
- Full cureWait for the full cure time before launching
When the paint is ready, give the hull the light sanding the data sheet calls for. Then dry, sand, paint and repeat as the system requires.
8. Apply Final Coat
Now apply the final topcoat the same way you applied the earlier coats.
After the last coat, the waiting game begins. Paint may be hard to the touch long before it is fully cured. Follow the manufacturer's instructions for the full cure time and for how long to wait before the hull goes in the water, and do not launch before the paint is ready for immersion.
Once cured, keep the finish looking good with regular washing. If the surface gets dull later, see waxing a boat.
9. Enjoy the Ride
The sun is shining, the coolers are packed, and the boat is ready for her splash. Get her in the water and take her out for a spin.
For many folks, the word BOAT stands for Bust Out Another Thousand. Regular washing and upkeep helps protect a fresh paint job and avoid bigger repairs later. Spend what you save on a picnic on the beach.
Frequently Asked Questions
What kind of paint do you use on a boat?
Use marine paint made for the surface. Polyurethane or marine enamel suits fiberglass topsides, antifouling paint suits hulls kept in the water, and aluminum needs a primer made for it. Always use a primer and topcoat that work together.
Can you paint your boat yourself?
Yes. Careful prep, thin coats and patience with drying time matter more than special skills. Large hulls, spray finishes and coatings that require supplied-air protection may be better left to a professional.
Do you need to sand the bottom of a boat before painting?
It depends on the existing coating, its condition and whether it is compatible with the new paint. Some systems need sanding or removal, while some compatible recoats need only cleaning. Follow both manufacturers' instructions. Antifouling dust can be hazardous, so check the safety data sheet, avoid uncontrolled dry sanding and follow marina and local rules.
Is it cheaper to paint or wrap a boat?
It depends on boat size, condition and labor, so get written quotes for both. A DIY paint job usually costs less than a professional job. A wrap does not repair damaged gelcoat.
What is the average cost to paint a boat?
There is no single number. Cost depends on hull size, the paint system, how much repair is needed and whether you do the work yourself. Compare the materials list and quotes from local yards.
How long should paint cure before launching?
It depends on the paint system. Hard to the touch is not the same as fully cured. Check the manufacturer's data sheet for the full cure time and the time required before immersion.
What to buy for this job
- Marine Degreaser Black Streak Remover. When soap leaves oil, grease or black streaks before sanding.
- Instant Boat Hull Cleaner. When waterline, rust or exhaust stains need to come off first.
- Premium Boat Wash Soap Concentrate. For the first wash to clear salt and grime.
- Microfiber Cloth Set 12Pk. When you need clean cloths for wiping the hull down.
Quick quiz
Tap a question to see the answer.
Why dewax the hull after washing it?
Wax and silicone residue can cause fisheyes, bubbling and poor adhesion, and washing alone does not remove them.
What is rolling and tipping?
Roll the paint on, then go back over it lightly with a brush in one direction only, when the coating instructions permit it.
Why remove waterline stains and exhaust streaks before sanding?
The sander will grind them into the surface, so they should come off first. Instant Boat Hull Cleaner
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