Yes please keep this open to all, a number of props in the 80s and 90s were painted with old automotive touch up paints, and these paint numbers were given out, but it seems the numbers changed over the years...the numbers years ago were right but the are not the same colors as they were.
OR the manufacturer cheapen the product making their paint crap, Krylon changed their Plastic Coat satin clear so it is not even near what it was in the 80s and 90s. And their normal paints changed as well. Their satin paints USED to be right between Gloss and flat but now a days satin is so close to gloss it is hard to tell them apart so again they are no longer as useable as they were, at lease for some years but they did seem to figure this out and it seems Krylon has improved back to near what they were.
And I used to use Zyolite Dark gray of Hot Rod primer on nearly everything again from the 80s to the late 90s but they also cheapen to the point I had to give up on them.
Alclad did the same, it got so bad that their bright aluminum would rub off before I could finish assembled parts, yet I have some older models painted with old paint that have not had any problems. I hear they have a new clear coat that does not bite the color coats and gives the silver a clear coat that lasts, I have yet to test this.
At one point the only near chrome or bright aluminum I could find was Nail Polish, with their own thinner....
And EPA laws have taken so many paints off the market, at one time I was using real automotive paint systems, like acrylic enamel, but the local EPA laws made these paint system illegal to sell and you can no longer get them.
So problems with paints covers so many of us in all countries.
Currently I am using small caned Rust-oleum protective enamel (they say oil based) and cleanup lacquer thinner as the thinner to spray though a air brush. These give a great finish.The only problem is they only seem to make base colors...black, white, red...
As for special colors you are completely out of luck.
My two cents worth.