From
JB Weld's FAQ page:
Q: How much heat can J-B Weld withstand?
A: J-B Weld (Part # 8265-S, 8265, and 8280) can withstand a constant temperature of 500 degrees F. The maximum temperature
threshold is approximately 600 degrees F for a short term (10 minutes).
Q: Is J-B Weld toxic?
A: No. J-B Weld is non-toxic. However, we do not recommend consuming the product.
Q: Is J-B Weld resistant to water and/or gasoline?
A: When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical. For wet-surface or submerged water or gasoline repairs, see our J-B Stik or Waterweld product information.
Q: Is J-B Weld microwave safe?
A: Yes.
Q: Is there anything that J-B Weld WON'T bond to?
A: J-B Weld will not adhere to, or bond well to:
* Any flexible rubber surface
* Leather
* Vinyl
* Canvass
* Polypropylene plastic <-- This is the main reason JB Weld 'breaks down' with exposure to propylene glycol
* Polyethylene plastic
After drying, it is non-toxic, at any temp below 500 degrees F, even once the bond is broken...
It's no 'strech' to read the manufacturers specs Willy... I'm not just pulling this outta nowhere ya know... I did do some research before I used it....