Do I HAVE to sand between layer?
I'm trying to build up the keel section of my boat with some marine tex. Do I HAVE TO sand between layers?
http://www.marinetex.com/Marine-Tex_how_to.html
How to prepare surfaces for bonding:
-Remove all rust, scale, paint and loose materials from the surface.
-Clean all surfaces so that any dirt, grease, oil, wax, etc is completely removed. (Lacquer thinner or acetone are excellent cleaners for many surfaces.)
-Sand a profile into the surface with 80-100 grit sandpaper to abrade the surface and provide a 'texture' for a mechanical seal.
-Wipe with solvent once more to be sure sanding dust hasn't contaminated the repair.
-Please DO NOT use soap! Soaps and regular detergents leave behind a residue that can cause a problem with adhesion.