Could Krylon Fusion "For plastic, Metal, Wood, wicker, more" be used to coat rocks and wood pieces found outside to make them tank safe ?

I bought this as I read a few times that Krylon Fusion Clear could help coat plastic decorations to make them tank safe.

However, I wondered if I could use it to coat outside rocks to make them safe ? Or wood from outside, to keep them safe and prevent them from releasing their tannins ?

Also, if it's okay, I read that we should let the decorations cure. How long should they cure ?

This is the can I bought :

 

I add outside wood and rocks in all my aquariums without coating them . . .

 

I know it can be done, but I don't know my trees and rocks enough to know which ones are which kind/species

I found some nice rocks a while ago, and I got them soaked in a storage plastic tank, and even after few days and a bunch of water changes, there was still ammonia each time I tested.

So I would not be comfortable adding those rocks with my live fishes, but maybe if I coated them it would keep whatever is causing ammonia trapped ?

Also for the wood, I don't want to colour my water with tannins and I though I could avoid soaking it in water for weeks if I just coated it tight

Also, aren't outside rocks and woods dangerous when we dont know if there are bacteries in it, or minerals in the rocks, etc ?

 

Yes, pretty much any aerosol paint is non-toxic these days. I've used Rustoleum Universal extensively on tank parts and decor, even painting the gravel to make it blacker. Just have to let it dry for a week or so.

 

Nice, thanks!

Will it be tight enough to keep whatever's bad in the rock or wood trapped ?

Also, what should I check/test for after a week of dying to know if it is now safe ? Ammonia, pH ?

Also, I just read on my bottle and it says "Clear, UV protection".

Is it "a clear that is also protecting from UV" or "a UV protector that is clear (as in transparent)" ?