Blistering paint

How long should paint be left to dry before steaming? A friend has just re-painted boiler cladding on his road loco, it was steamed 3 days later, the result was blistering in several place round the boiler bands. Because the boiler bands have more heat transfer I would guess this is the problem, or is there possibly another issue. How long should you leave new paint to dry, he used Rustolium spray undercoat and top coat. Thanks David.

What I’ve been doing lately is painting and letting things sit and cure for about a week. Haven’t steamed anything, yet, so it’s not a definitive answer.

I normally allow a week at least

Thanks for that, I thought that was the problem. David.