Hi, I am about to repaint my (non-enclosed) porch. The top coat is latex floor paint right now (did not do this myself, done by previous owners). It flakes kind a bit, since the porch is open on 3 sides and exposed to rain. I am debating what the best way is to paint the porch. My original plan was to sand it down completely, and put an oil based floor paint on it. However, the house is from 1910 and there are 4--5 layers of paint on the porch already. Although the lead paint test kit was negative, I don't trust it. The bottom 2 layers are so hard to remove, I'm kind of convinced it is lead paint anyway. So, sanding won't work. I scraped the worst loose paint this afternoon, wondering what to do next. I want to avoid just putting another layer of latex floor paint on it: it will flake within 2 years and 3 years from now I'll be painting it again. The hardware store advised me to put deck stain over the paint. I don't believe this can work though. Paint covers wood and stain penetrates it, right? If it has been covered already, how can the stain still do anything? Any thoughts on this? Alternative: put oil-based primer on it, then oil-based floor paint? Or even just oil-based floor paint and no primer? Thanks for any input!