I'm currently doing an all over color change on a car including some collision damage. I routinely use a product called Slick Sand to speed up the process. It is essentially a spray on bondo. This time, I put the product on last Saturday morning. It normally takes 12-24 hours to be able to sand, depending on temp. As of today, it is still soft. On Monday I spoke to my paint rep about it. First thing she asked me was " how old is the hardener " ? It was about 6 months old, but in the past I have regularly used hardener that was within a year old.
She now explained to me that aparently the gov't has declared that the chemical in hardeners as a preservative, is now outlawed. This issue of non hardening putty and spray poly's is becoming more and more of an issue bacause no one was told of this.
I was advised that any tubes past their date should be thrown out immediately, and any hardener that has been opened and will not be used within a month should also be tossed.
If you look at the crimped end of the tube there is an almost illegible number stamped into the crimping. THIS is the experation date. Good luck reading it
I now have to sad off all of the primer I put on this car. there goes a day plus in time and probably a roll of sandpaper