The only options I know of are
1. re-plaster (or similar methods, such as DiamondBrite)
2. paint with epoxy.
Epoxy is the only DIY method. It's not hard, but it's very, very icky-picky. I've often joked that -- unless your prep work is by the book and very careful -- "epoxy paint sticks to everything you don't want it to, and nothing that you do"! But, it's more true than not.
Years ago, a high school teacher who'd been working for me, got married with a series of cuts and scrapes all over his hands and his arms, where he'd used a knife to pick off tiny "Viking Blue" epoxy splatters from the pool we'd painted 2 weeks before his wedding. His fiance was NOT happy with me!
If you want to pursue that route, I'd recommend Zeron paint from this company: http://www.kelleytech.com/olympic/ Read the instructions carefully, before you decide to buy, and make sure you're willing to follow through.
Epoxy paint is probably NOT a good choice for a contractor -- most of them will go ahead and paint even if it's too damp, so they can get on to the next job. However it can be done very adequately with closely supervised day laborers. There are other epoxies beside Zeron, but Zeron is the only one I've used and know will work. With the other products, I don't know if the 'horror stories' are due to the product, or due to installation errors. But, I've never wanted to risk a failure in order to find out.
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