Well today I tried the Tamiya surface primer thinned with Ethyl Alcohol. Big no go. As soon as the alcohol hit the Tamiya primer it gummed up and tuned into a big blob in the mixing jar. So I mixed up another batch using generic lacquer thinner and that worked just right.
Hmm. That’s very strange. I’ve never had a problem with Tamiya LSP and methylated spirits, which is 95%+ ethyl alcohol (ethanol). My jar of LSP is several years old though, and they may have changed the formula - won’t know until I buy a fresh jar.
I am wondering if that is what happened. Or if ethyl alcohol is a different formula/percentage here in the USA.