ORIGINAL: NCIS
I have been using West Systems 404 adhesive filler added to my thinned down 30 minute epoxy. It seems to take longer to cure. I like to use the filler when I have any voids to fill so there aren't any air pockets. Does anyone know why it takes longer to cure? Plus even though it's cured it still remains slightly flexible beyond the 24 hour time. In a week or so then it is hard as a rock.
Barry
www.canopyrailsforwarbirds.com
It's most likely the 30 minute epoxy.
If you use West's own epoxy, that won't be a problem. I get their resin in the pump cans, and use fast hardener for most things. (For casting parts in molds I use the slow hardener.) I've thinned West epoxy with acetone, laquer thinner, and denatured alcohol and it always hardens. Their resin is thin enough, though, that you shouldn't have to thin it any more.
Jim