It's true it's Gypsum Mites, they are found on the gypsum rock mined from below the ground & they make it into the bags of plaster in the factory during bagging process, when they have contact with water they try to escape to the surface, this is what causes the bubbles and the noise you can hear, there's a scientific explanation/name for it on the web.
Saw a documentary on it years ago plus the British Gypsum mine tour told us the same when I asked them.
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is it over bonding?
I said that to lad to be fair it seemed fine then just turned in to a aero . Gonna call down at weekend see if it' still upUnifinish on silk paint would of been better
Mite be worth ago on your next silk job
Unifinish on silk paint would of been better
Mite be worth ago on your next silk job