Quote Originally Posted by indiej View Post
It is possible to check the condition of the last product applied. Once another layer is applied, it's gonna be difficult to check the condition/presence of the previous layer. There could be a way but mostly, what's under there is faith.
For the LSP, I check on the beading. For the cleaning/polishing, I base on the how the paint looks, if it's filled with scratches or kinda looks dirty. But to accurately check the condition of the previously applied product, your guess is as good as mine.