4. Sealing the edges: To prevent h2o from getting into under the foam decking, it is vital to seal the sides wherever the foam meets the boat's hull. This may be accomplished by using a maritime-grade sealant, and it is crucial to follow the manufacturer's Directions for suitable software.tst ivm.clk mmh2 clkh2 achf nopl spfp4 uam1 lsph nmim1 slnm2