I have a vinyl floor (tested neg for asbestos) in a bathroom. I am remodeling, and plan to put down porcelain tiles over backerboard.
I am able to scrap off the vinyl layer, but there is a paper backing and mastic left. I bought some Sentinel 747 cleaner, and it looks to be promising. Once I get it down to the 3/4" plywood, will I be ok using Hardiebacker (1/4") over thinset without any additional steps? Or do I need a rinse step? Thanks.