[35prog]

I shot some Upol reface on a truck that I am working on. The directions state to mix it 3% by volume or 5% by weight. I mixed it 400 ml to 12ml of hardener. There was a very minor additional part of hardener in the last batch. I applied it with a 2.0 tip sata gravity feed gun 2 coats over the body work. This was shot yesterday at 4pm (completion time). I left heat set at 70deg overnight. I went out this morning to find it was soft and was loading 180 sand paper. I put a short wave infra-red lamp on it and heated it, let it cool to find that it sanded better. However, it appears it does not want to feather back properly. This is a polyester filler. I know it has been sitting on the shelf for awhile. (1 year?) maybe, I was not able to find any info regarding shelf life. Will polyester hardener go bad? I scraped and sanded all the filler off and will start over. This time I will use Slick Sand. Man, today sucked!!!

[Daz_uk]

I used it for the 1st time just the other week.
I didn't have any problems,left it over night to air dry and sanded fine the next morning with 80's,probably a bit coarse but worked ok for me.
I was doing a full panel so didn't have any issues with feathering the edges and it went over other filler too with no problems.

Did you stir it thoroughly,it does tend to settle out in the tin if it's been on the shelf for a while....the resin seperates