I would trust Rust-Oleum. My guess is that it would work fine in a guest bath.
Story: Years ago I was doing some work for an owner of industrial properties. He was having me refurbish a unit for a new tenant. When we walked past the small "coffee counter" we saw that it had a bright orange-red laminate counter top. He said "do something with that".
I sanded it lightly and primed it with an oil-based primer. The mistake I made was to paint it with a latex paint. The latex stayed on ok but when the tenant wiped it down with a damp rag, it turned very dull and looked bad. If I had used an oil paint, it would probably be fine yet today.
Back to your situation, follow Rust-Oleum's directions carefully.
Posts: 12114 | Location: Eagle, CO USA | Registered: Sep 18, 2002
A few years ago, replaced sad sink & faucets in main bathroom. Actually did the plumbing by myself... and I'm NOT a plumber. Since I was replacing EVERYTHING, was able to hook everything up before just setting sink into hole... then just hooking up hot & cold connection and trap.
Countertop was a dated 70's "woodgrain" laminate or some kind. I just went for it and painted away. Had another bathroom accessible, so was in no rush to finish project. Scrubbed the HECK outta countertop and roughed up a bit with sandpaper. Rolled on 1-2 coats of Kilz primer. Then did a faux marble with some left-over, semi-gloss latex and a few colors of craft paint (those little bottles that go on sale 5/$1). Gave it a few days to thoroughly dry before a few coats of non-yellowing sealer. I came out really nice... if I do say so myself. A replacement countertop was NOT anywhere near being in my budget. It has held up find... maybe 10 years?? If I slosh water, I do make sure to mop it up... don't want any to seep under paint... hasn't happened at all... knock on wood. After that success, went on to do the same thing on much smaller area in smallish bathroom in master bedroom.
Posts: 5521 | Location: mount holly, NJ, USA | Registered: Sep 19, 2002
for countertop paint, I used Gianni Granite Countertop paint in my kitchen, covered emerald green laminate and now it looks identical to Silestone "Rosa Grey". Suggestion you look at giani's website, facebook page (there are hundred of user's before/after photos), and also on youtube (enter giani granite in the search engine field). I am beyond thrilled with this product, I will be using it on a hall bath vanity top over the upcoming holiday weekend.