I don't know if it needs to be sealed as the foam is typically rated 90+% absorption-resistant. But I figured it would serve as a protective shell (the foam feels fairly fragile), primer layer for paint, and also a surface for the adhesive strips I'm using to attach the foam to the gopro's backdoor (ever try to stick tape on foam?).
I used a 50/50 mix of aquaseal and cotol, maybe even 40/60; lots of cotol to thin out the goop and make it easily spreadable. I used a flexible rubber spatula to "paint" the aquaseal over the foam and scrape off the excess. The thin layer doesn't make an appreciable difference on the block's buoyancy.
I used a 50/50 mix of aquaseal and cotol, maybe even 40/60; lots of cotol to thin out the goop and make it easily spreadable. I used a flexible rubber spatula to "paint" the aquaseal over the foam and scrape off the excess. The thin layer doesn't make an appreciable difference on the block's buoyancy.