Yes, as long as the surface is prepared properly, both TotalBoat Krypton antifouling paint and TotalBoat AlumiPaint AF will adhere to a tin-copolymer antifouling paint.

Surface prep involves sanding the surface and wiping clean with a lint-free rag. Alternatively, you could remove the existing tin-based antifouling paint completely before applying AlumiPaint AF or Krypton.