Flex SealSpray Rubber Sealant Coating, 14-oz, Almond (2 Pack) ÂÂ

can you paint it?

Will it stay on leather?

Will this work on a boat hoist canvas tarp?

I have a 5 sided shower in an older 5th wheel rv that i need to fix a few cracks in the walls of the fiberglass. how do you think this product will do