Quarter panel removal?

CUUDAC just as I suspected I can't get GEM anywhere in Canada that I can find.So I'd have to have it shipped in which I suspect they will need a arm and leg for where it's a chemical.Looks like it would be good stuff I like the fact that it is watery that way it would seep into places.Does it stay kinda wet after or does it dry up? I'm thinking if I can't get any of this stuff That I might use phospheric acid just because I can spray it all then paint it after.Brushing stuff up in there isn't really going to get everywhere I don't think.
Thanks!