I am painting the subfloor in my house (plese dont tell me not to, I am aware of all the issues and problems) I have taken up the carpet and cleaned the subfloor. I need to "fill" the cracks and level it out. I have read to use wood filler, caulk, flexable floor leveler, bondo, basically everything. I read here w.askthebuilder.com/painting-floors-really-works-well
that you need something hard to fill the space but wouldnt the filler crack? I have seen flexible floor patch and leveler but will it be hard enough?
any help is greatly appreciated.