Sorry you had to go thru this. I didn’t think about you being in the UK and the possibility that you might be using pigments and laminating resin that I am not familiar with. If your hotter “cheater coat “ didn’t do the trick; You will just have to wait it out. Keep the room warm and check it everyday. It will eventually harden up. The one I had trouble with was Opaque and had lots of Yellow, White and Tawny pigment in about a U.S. quart of resin. My first mistake was probably just using tooo much pigment. Could have used less and got the same effect most likely. Secondly; I didn’t use enough MEK. I was never taught % MEK. Was taught to use CC’s per volume. I think their is a Fiberglass Hawaii YouTube video featuring Otis(well known master glasser in Hawaii) in which he uses 30—40 cc in enough resin to do a blue tint on a longboard. That’s probably about 1 1/2 quart of resin. 30—40 cc is a lot of MEK. But when I tried it on the next one it went off without a hitch and provided me with plenty of time to flip the board and cut my laps. The yellow and Tawny board actually drained for 3 or 4 days. I mean resin running off the board and had to be squeegied every so often. I finally kicked it with a very fast and hot filler coat. After that it was fine. Lessons to be learned my brother. Lowel
I think Lowel mentions a good point... in addition to bumping up catalyst ratios with pigments, not overdoing it with pigments, adjusting temperatures, etc., it definitely pays off to become familiar with the particular resin you're using. Different brands have slightly different formulations that may include greater or lesser amounts of accelerator. The accelerator (usually some sort of cobalt) is not the same as MEKP. In days past some resins were labeled 'pre-accelerated' but I haven't seen that in awhile.
One thing no one has mentioned. Where do you store your resin? Is it kept in the same work space where your heater can't get the ambient temp above 60?
I'd bet that the resin is even cooler than 60 when you mix a batch. It will only get cooler with time, as you work.
Keep your resin in a warm room with ambient temp above 70. Or, pour enough for the batch intended into a plastic mixing bucket and put that in some hot water for a while to warm it up.
“That which can be asserted without evidence, can be dismissed without evidence.”
Yes, you’re right and make a very good point. I have had stored it in the cold garage, the first thing I thought as soon as I hit it with the squeegee was “I’m sure it’s thinner and easier to spread around on the videos I’ve watched?” It’s kind of making sense now. Unfortunately I didn’t have the foresight to get it up to temp enough for the clear coat either, which I think has meant I’ve ended up using too much resin on each coat so far and having what looks like a pretty iffy hot coat at this stage, due to it all being a bit too thick and taking so long to settle. I’m confident I can pull it back from here though, with some careful sanding and better hot/gloss coats done in warmer temps! I cut the laps today as it has got a lot harder but if I’m honest, it was still far too early. I now know when is too early though, and it is drying so all good! It’s definitely not going how I planned/hoped, but I knew it wouldn’t be as easy as the good guys on the internet make it look!