I don't know how many people have heard it, but 1966 is the last year that Holman Moody supplied stock Galaxie bodies for NASCAR racing. They never used real stock bodies again. Using stock bodies was born from the requirement that any car raced had to be sold in the quantity of 500 units to the public. From what I understand, when Ford went to using a Fairlane body for racing in 1967, it was a uni-body which was unacceptable for safety in racing. From there it evolved into tube frame bodies specifically made for racing. That is what is interesting about this 1966 Galaxie kit as a NASCAR racer.
I think if there was enough demand for a '60 El Camino, it would have been done in the last 40 years. I'm sure AMT and Revell considered it but got no bites from distributers or stores. It also hurts that there are tons of reasonably good built (and sometimes unbuilt) original AMT '60 El Caminos for sale on eBay and other places. Then there are resin copies, and Do It Yourselfers that marry a '59 AMT with a Revell '60 Impala. If somebody made one new, I would buy it. I think the chances are low.
I am going to have to agree with Harry P. While I have not seen this with spray paint cans, I have seen it happen with soda cans that just sit in a controlled environment and no agitation. Over the years it has been the can companies goal to reduce the material used with no adverse affect on performance. About 30 years ago, there was a soda company in Massachusetts that had tons on cans releasing their contents with nobody doing anything to cause it. The problem seemed to go away as I never saw or heard about again. But, the cans are not as robust as they were 40-50 years ago, and probably less now. It wouldn't hurt contacting the paint company and telling them what happened. Maybe they have fixed the problem already if some have complained. I am sure they don't want it to continue.
Nice job restoring it to a convertible. Those wheels did not come from that kit for sure, but I don't know the Tom Daniels kit well. I bought that same '58 Impala kit at Sears when they used to sell models. It's the first of the AMT foldable boxes which I think began about 1971. Should have a T273-225 kit number, I think. -225 means $2.25
Walmart in Hudson, NH carries model car kits but the Walmart in Hudson/Marborough, MA does not. About a 30 mile separation. Last time the Massachusetts Walmart had models was in the ERTL checkered box days.
Tom, you are correct. It has to fit before paint and assembly. I am guessing that maybe there is a 5% shrink in a resin copy versus original. Even still, the body is thicker in the resin that original and it is not consistent in thickness. There are 2 Modelhaus '60 rear bumpers. One is the Impala shown above used in the AMT Craftsman Nomad kit. You need to order the promo '60 rear bumper for the Nomad which has 4 tail lights.
While 1975 is the first year rectangular headlights showed up on new US cars, I believe the Federal law changed a few times over the years . It dates back to 1940 when a new law stated that only 2 round sealed beam headlights were allowed. In 1957 it was revised to 4 round headlights and again in 1974 to allow square shapes. A lot of the European spec headlights used replaceable bulbs that did not fit the law. Headlight covers were allowed in 1983 with replaceable bulbs. This allowed more aerodynamic car body shapes for efficiency. Those rectangular shaped bulbs on both Olds were illegal until 1974.