A contractor installing and painting baseboards said he could paint the wainscoting in our half bath. It is gloss latex paint over the old gloss latex paint, but I don't think the walls were cleaned or prepared at all, and am sure they were not primed before the new coat, and over two weeks later I can use my fingernail to pierce the new paint and peel a 4 foot section down the wall. The wall here is covered in a plywood wainscoting with a small beaded double groove every 2 inches.
Since it is wainscoting, how can I remove this new coat, including in the wainscoting grooves so I can re-paint it properly? A paint scraper won't get in the grooves, at least not without damaging the bead.