How to paint a GFK boat accomplished

The hull and deck construction of plastic boats is made of fiberglass (GRP). Most of the actual plastic body is coated with a layer of gel coat and has usually combined with the underlying GRP to a homogeneous structure. Therefore, the painting of fiberglass often corresponds to the painting of gelcoat and vice versa.

Always aim for complete painting

After removing the boat in the spring, often a new paint job is due. If it is a cosmetic repair, the areas on the hull and on the deck must be thoroughly cleaned and lightly sanded. Then you can start painting immediately.

If damage is discovered, such as hairline cracks or bumps caused by the osmosis of GRP, the boat must be restored. Here it is recommended for functional and optical reasons, always make a complete fresh paint.

Complete paint develops protective properties

Even if only a few places on the hull or the deck structure have been repaired or filled, a complete painting promotes the further resistance, hardness and sliding property of the boat hull.

Grinding the GRP or sanding the gelcoat creates an adhesive surface. With thorough and professional partial repair of damaged areas, the entire surface is newly protected by the paint.

Selection of the right type of lacquer

Choose the type of varnish that best suits your needs:

  • Alkyd resins are easy to process, have a high degree of gloss and strong elasticity in the early years and do not need to be mixed. After a few years, the shine is lost, they are not very scratch-resistant and do not tolerate any chemical stress.
  • Epoxy resins are mechanically and chemically very resilient, isolate, do not let water vapor through, adhere very well and offer corrosion resistance. They are not very UV-resistant and very sensitive to processing.
  • Polyurethane resins have high UV resistance and are very resistant to chemicals and heat. The two-component coatings are less flexible and very sensitive to moisture during processing.

How to paint your boat from fiberglass

  • Resin varnish of your choice
  • Optionally additive
  • Optionally color pigments
  • brush
  • String role
  • Eventually spray gun
  • Boat suspension or trailer storage
  • Respiratory and eye protection
  • gloves
  • Lint-free cotton cloth

1. Sand the substrate

Grind the throughout through hardened gelcoat with grain sizes between P60 and P100 evenly.

2. Mix the paint

If you have not chosen a finished alkyd resin, mix the paint according to the manufacturer's instructions. Be sure to mix only the amount that you can process in the specified pot life.

3rd strike direction

Always swipe from top to bottom and from left to right. Follow the imaginary imaginary plank course at each stroke.

4th layer thickness

A coat of paint ideally adds one millimeter and three to five coats are enough to give you a durable and visually attractive finish.

Tips & Tricks

If the pre-coating consists of a two-component coating, you must process a two-component product again.

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