Sand your complete item with fine-grit sandpaper or maybe a sanding block to remove any aged end, lacquer, or gloss. The intention is to not sand off the plastic veneer, but only to scuff the floor and give it "tooth" that should help the paint coat adhere. Whilst Angie’s Listing https://featuredexpertbuilders.blogspot.com/2019/11/a-quality-finish-refinishing-veneer.html