HOW TO PAINT PREVIOUSLY PAINTED BOTTOMS
The condition of any existing coating is important in order to provide a sound surface for the new antifouling. If the paint is in poor condition, remove it with Interstrip 299E and follow procedure for bare work.
Check for compatibility; see compatibility chart on the Original Article link below or Interlux Color Card.
If you know what antifouling is currently on your boat, you can quickly determine whether your Interlux paint choice is compatible.
Remove all traces of loose paint, dirt, grease and other contamination by wiping with Interlux Special thinner 216. Sand with 80-grit sandpaper. Remove sanding residue.
Apply 2 coats of Interlux antifouling.
UNKNOWN; PRIME BEFORE PAINTING
If you do not know what the old antifouling is on your boat, it is still easy. Use Primocon as a tiecoat primer. Then simply overcoat with the Interlux bottom paint of your choice (not compatible with VC 17m, VC 17m Extra, VC Offshore or Baltoplate).
Remove any loose, flaking areas with a scraper. Sand with 80-grit sandpaper. Rinse with fresh water and allow to dry before applying the new antifouling. If the old coating is in poor condition it is advisable to remove it. Apply Primocon primer directly to the old antifouling.
If the old paint is in poor condition remove it. For removal, we have the easy solution, Interstrip paint remover. It's compatible with your valuable fiberglass hull and can remove several coats of paint in one application. After stripping, you are ready to prime and paint your newly cleaned hull.