A clean hull finish makes a model look polished, and the waterline is the detail people notice first. This guide covers a typical approach for plastic and wooden hulls.
Prep and priming
Fill gaps, sand seams and clean the surface of oils and dust. For plastic, wash with mild soap and let it dry. For wood, sand through progressively finer grits and seal the grain if you plan an opaque finish. A primer helps paint stick and shows flaws before the color goes on. If you have a plank-on-frame hull, finish your planking and sanding first, because paint exaggerates flaws.
Choosing paint
For models, hobby enamels, acrylics and lacquers are common. Each behaves differently: acrylics clean up with water and have low odor, enamels level smoothly but cure slowly, and lacquers dry fast but have strong fumes and can attack plastic or earlier layers. Do not mix paint types on one area without testing. Marine paint made for real hulls is generally not necessary for a model and may be unsuited to plastic. Whatever you use, check the label, ventilate well and wear a suitable respirator when spraying.
Marking the waterline
The waterline should be level when the model sits as it would float, which on kits is often, but not always, parallel to the keel. A common method used by builders:
- Mount the model firmly on a base and level it.
- Check photographs or drawings for where the waterline sits. Some kits have a molded line, and some hulls are cast in upper and lower halves.
- Clamp a sharp pencil at a fixed height above the bench so it reaches the hull’s midline.
- Slide the model past the pencil to scribe a continuous line.
A boot stripe has a constant height measured vertically, so on a flared bow or tucked stern it will look wider along the hull surface.
Masking and painting the boot stripe
One approach is to prime, paint the boot stripe color first without fussing about masking, then mask along the middle of the stripe and paint the topsides. Burnish the edges of low-tack tape, and remove it slowly at an angle once the paint is touch dry but not fully cured. If paint bleeds, touch up with a fine brush.
Common hull colors
Colors depend on era, navy and ship type. Many 20th-century warships carried gray, merchant ships often had black or dark hulls, and the underwater section was commonly red or a dark anti-fouling color. Sailing warships were frequently painted in bands. Look at references for your specific ship; our free plans guide mentions sources for drawings.
Wooden hulls
On a wooden model, you can paint the entire hull or only the lower part and varnish natural planking above it. Sand lightly between coats, and keep brush strokes running with the planks.
Finishing and weathering
A satin or matte clear coat protects the paint and unifies the surface. Light washes and streaks can add realism, but go slowly. Let everything cure before handling or mounting on a stand.
FAQ
What type of paint is best for model ships? It depends on the material and your tools. Acrylics are easy to use, while enamels and lacquers have their fans. Test on scrap.
What color are ship hulls often painted? Commonly gray, black or dark colors above the waterline and red or dark colors below, though it varies widely.
Can I use real boat paint? It is made for real vessels, not models, and is rarely needed.