Alright lads first time post. I was skimming over a wall in a school sports hall today 40m. I pva'd the wall yesterday 5:1 then did it again this morning 3:1 left it to go tacky then started skimming. Ive been spreading for 11yrs but never had this problem, the multifinish wouldn't firm up. Ive left some in a gorrilla tub and left it in the van just checked it and its still soft, anybody had this problem before I never have its got me baffled any ideas. I give up after 3 hours and scraped it off and started again it went off as normal weird.