

Layers of paint problems
I need to paint just about every service of a 2000 square-foot house DIY. It’s over 100 years old. I haven’t tested for Lead, but I’m sure it’s there. before I get painting I will test. But I’m trying to come up with a rough game plan.
Some of the walls are painted with glossy paint over textured wallpaper. A lot of the paint and wallpaper is either chipping or peeling or bubbling out. The very base of the wall is plaster not drywall. All of the wood trim, windows and doors are painted.
Before I started thinking about Lead, my thoughts were to use BIN primer i’m just about every surface after pulling and scraping any loose bits off. There’s also some interesting artwork consisting of flat glass marbles hot glue glued to plaster walls that needs to come down . So there’s gonna be quite a bit of damage to that surface. My hope was that with a shellac base it wouldn’t cause the wallpaper to swell and peel more.
After thinking about lead, I looked at the encapsulating primers, but they all seem to be water-based.
Can I make a primer/ primer/ paint sandwich? Using the bin over the base and then lead guard over that to lock everything in and interior paint on top? Or is there another product I just haven’t come across yet that would do a better job for both?