Ugh ... I hope I don’t screw it up.
NCL formulations themselves have changed over the years.
There are actually plasticizers in NCL to help it with the small expansion/contraction issues it will experience in normal use, but it does get dryer and more brittle as it ages.
The late '70's/80's models tended to have thicker finishes to start with and apparently had more solids and less plasticizers, so are probably the most susceptible at this point.
'90's/ late Westerly had a rep for thinner finishes, probably less likely to crack like glass.
Corona was actually known to have teething problems with learning how to spray it, they were new to the process and had a brand new spray booth for it besides, and the finish on my Corona D40 is the thickest of the 3, it WAS "like glass" when it was new.
But NCL suppliers in general were reportedly increasing the plasticizer content by then, apparently it was more compatible with an environmentally friendly formula, too.
Still, I wouldn't willingly risk a temperature shock to it.
Don't have as much info about Tacoma, but suspect you'd have to jolt one of those or an NH pretty good, to get checking.
Can't recall any reports of that on those.
I can’t stand this waiting stuff ... there is a dang guild in the house and I can’t open it !!!!!
You could burn a couple of hours searching old string threads here.
Hope that helps.