Corvettes & Cold Weather
Back in the day when our classic Vettes were contemporary modes of transportation and driven all year round (which is why so many of them have rust issues with birdcages and frames), I think that the word would have gotten out if cracking fiberglass was a common thing. I grew up with C3's and my dad drove his in the winter (in the snow) - he never said anything about cracking fiberglass in the cold. Moreover, I don't recall seeing anything in the owners manual about it either, which is where I would expect to see cautions such as that. Someone who has a different experience will likely chime in though.
The solution, of course, is to only drive it on nice sunny days. In closing though, do your due diligence and research on the topic from a variety of trusted sources.
Last edited by Corvette-ZL1; Dec 2, 2022 at 11:21 AM.





That's a 1200 mile round trip from Omaha and the temp never got above 10 degrees the whole time.
44 years later I still don't have any cracks...






The Best of Corvette for Corvette Enthusiasts

This isn’t meant to be glib, but is more to ask questions.
Some materials do become more brittle or less pliable over time. I think we can agree that 50-year-old rubber weatherstripping, belts, hoses, tires, etc. all need to be replaced at some point. I worked in a building that was constructed in the late 1950s. It had a huge wall of glass window panes with the original rubber stripping; the rubber was cracked and worn. The glass panes rattled with the wind, and I could feel the wind around the edges. I’m certain that the windows were not as waterproof as they were in 1958, or even 1968.
Freezing temperatures can affect pliability as well, as we learned in a truly awful way when the O-ring seals on the Space Shuttle Challenger failed due to the freezing temperatures in Florida. Florida! Freezing is freezing. So, would a Toyota’s rubber bumper crack? Maybe more so if it were in an impact in 21 degree weather than in 68 degree weather. How about a 50-year old Toyota bumper?
I have no doubt that, when new, my ‘69 C3 could withstand extreme temperatures, and I’m sure it was driven in the rain and in the snow.
It is known, however, that the fiberglass does move and shrink over time, which is how the bonding strips become more visible, especially at the front valance/nose area. I frankly do not know whether its now half century old fiberglass is more brittle in any temperature, or if it is is more vulnerable when temperatures go down to the 20s or lower.
.
we often test paints and the same test at ambient vs frozen are extremely different.
Frozen gravelometer is a frequent test.
the car is parked outside for some reason....
light rain occurs....
temp drops below freezing for a couple days
.water that has seeped into the crack and bonding strip freezes causing the crack to get larger....
other than that, I got nothing.
.
Ed





No stress cracks per say.
Last edited by CarterDawson; Dec 10, 2022 at 07:43 PM.















