?What material are your floats? I use polyu. varnish for many applications on my planes. Recently I refurbed a 1/4 scale glider which had balsa skinned wings covered in white shrink film, this I stripped and applied l/wt glasscloth (10-17g per sqM) brushed on with wa.ter based poly. varnish, building up in thin coats until weave filled, rubbing down with 320 wet'ndry used wet leaving a hard flexible finish for any colour system. Ive also fixed boats in the same way! It works, its clean and its easy! The best in the UK is Ronseal Diamond, I'm sure any Home Depot in the US has similar.
Try it,
Daveosoar.