"The paint adhesion is great." For DIYers, take care if refinishing a fiberglass tub, because it can be difficult to sand the surface evenly for a smooth finish. Start with 400-grit sandpaper to ...
In addition to concrete, it also works on stucco, fiberglass ... siding or furniture with just a paint scraper or coarse sandpaper. For tough, resistant finishes like varnish or layered paint ...
The second is via spray cans (such as those pictured above), which is quickest and simplest, especially if you’re bulk-painting a whole army. Games Workshop does decent ‘rattle-can’ primers in a range ...