Boat Painting DIY Series: Making Small Repairs to My Boat's Fiberglass Surface

Making Small Repairs to Fiberglass Surfaces

Stuart Jordan, Specialist in Epoxies/Fillers Development

When working with fillers it's important to remember that epoxy fillers are recommended for both above and below the water areas; polyester fillers are suitable for use above the water only. Interlux Watertite is a two-part epoxy filler, suited to most DIY repairs above and below water.

1. Health and Safety

Before commencing preparatory work, ensure the area you are working in is adequately ventilated. Ensure you are wearing the correct PPE; we recommend safety glasses, goggles or visors, nitrile rubber gloves, overalls (ensuring skin is not exposed) and a face mask.

2. Inspection

Inspect for damage. Small repairs can be tackled easily, but any damage affecting a large area, or affecting the structure or hull integrity, should be referred to a professional for proper assessment.

3. Preparation and Priming

Remove any loose filler or gelcoat and abrade edges to remove loose material. Remove all debris and prime with InterProtect 2000E or Epoxy Primekote, according to system recommendations provided elsewhere in this guide. Apply Watertite or Interfill after the first coat of primer.

4. Applying the Filler

Mask off the damaged area and apply Watertite using a putty knife or spatula. Allow to cure, following the recommendations provided on the product label.

Once cured, sand with 80-220 grit paper. The finished repair should be smooth and level with the surface. If required a second layer of filler may be applied, repeating the same process. The repaired area can then be primed, ready for painting.