I had new stainless chainplates made for my boat and am ready to install them. I plan on using Sikaflex 291 or 4200 to fill the gap around the chainplate and the caprail/deck, and then using butyl tape to seal the cover plate.
Based on some research
, I got the chainplates polished to a mirror finish, supposedly the reason is to aid in avoiding crevice corrosion
where the chainplate is sealed up.
HOWEVER, this is where I am confused. Any sealant
recommends that the surface be scuffed up for adhesion, and this goes against the idea of the polished finish.
What gives? Should I scuff up the metal before sealing it to help adhesion of the sealant
, or leave it the mirror/polished finish and risk the sealant not adhering properly?
this is what happens when you do too much research
conflicting steps, both seemingly necessary though