Primocon is an anti-corrosive primer for underwater metal surfaces including hulls, running gear, and the lower units of outboards and I/O’s. It will provide an excellent barrier to reduce pitting of the metal from galvanic corrosion. For underwater aluminum use Interlux Pacifica Plus, Trilux 33, Trilux 33 Aerosol or Tri-Lux II with Primocon. For non-aluminum underwater metal use any (non-vinyl) Interlux antifouling paint. Primocon is also recommended for use as a conversion coating over Tin-Based antifouling paints such as Micron 33 or Micron 44 or unknown well-adhered antifouling paint to improve adhesion and to prevent cracking of new antifouling paint. Primocon will not affect the color of antifouling paint.