Cracked Spot Putty

jcclark

jcclark

Oldtimer
This is a hail damaged fender I did a couple months ago, it was fine
when it left my shop but several weeks later it cracked.
I've been using this 2K putty brand for years and never had a problem.
This really puzzles me to why it happened, it wasn't even over a hail dent,
just a skim coat over the panel. Any you guys experience this or know what
caused it?
 

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That sucks. Any other problems from that batch of filler? Looks like the filler shrunk, but hard to know exactly what the problem was.
 
It was definitely the spot putty that cracked.
It was "Icing" brand, and I've never had a problem with it before.
I'm still using it today and it seems fine.
I now wonder if maybe I overheated it with my heat lamp,
I can't remember for sure.

But guess what! I just buffed the panel out and found 3
more areas with tiny cracks, so I'm back to bodywork
and repainting. This really does suck.
 
I wonder if the material below was reversible, and sucked some styrene out of the filler or caused some other problem.
 
Material below? Only thing below it was the steel fender. Some places had
a trace amount of body filler, but not much. This was hail damage,
I filled all the dents with body filler then a thin coat of spot putty
across most of the fender to not miss any.
 
I've never seen that from overheating! The only times I've overheated putty, the whole mess just lifts and gets peeled off the metal!
I am best pals with my non-contact thermometer nowadays...
 
When I've done it it does one of 2 things. Way to hot it does what you said. When it's borderline too hot it wants to shrink and crack, you can kinda chunk it with your finger as well. It gets crumbly. This is noticeable if you don't sand it right away and it cools. Like if you ended up sanding it next day even though you put the lamp to it. Maybe it's not but that's my best guess as I've had something similar happen in the past. Everything else being equal I'd say it was the lamp getting it too hot being that he used one.
 
Thanks guys, I hope the heat lamp was the problem,
I do have a non contact thermometer, most times I don't use it but maybe
I will more after this.
 
Tube of activator sucked air and was weak as they do have an age problem???????
 
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