Jake,

I did that once. There's nothing wrong with wet-on-wet lamination with polyester resin. Unless there's something drastically wrong with the chemistry (like, that wasn't catalyst), if you bring the temperature up to around 70 degrees, it'll cure. The only problem you might encounter with the delayed cure is some drainage of resin from the laminate, leaving undersaturated areas. In my case, I was reinforcing a GRP rowing shell with a layer of glass inside, didn't cure at all overnight in weather similar to yours, but the next day was sunny and 60, so I put it outside - the combination of somewhat higher temp and UV from Mr. Sun cured it in half an hour. One more thing - DON'T spray catalyst on the surface; bad juju.

good luck,

Mike
: I'm building a completely composite kayak, and I layed the first couple
: layers of fiberglass on it on sunday. I'm working in my garage, the
: temperature was a little chilly, about 50 degrees. Sunday night it rained
: pretty hard, and got a bit colder. It's been between 30 and 45 degrees
: since then. I used about 1.5% catalyst in the (polyester) resin mix, an
: amount that should have caused the stuff to cure in about an hour, if the
: book I have is right. Now, 2 days later, the resin still isn't hard, but
: it's not very tacky either. Will it fully harden if I let it sit? Is there
: anything I can do to speed the process up? I was thinking of maybe
: spraying some extra hardener on the surface, but that seems pretty
: drastic. Since I dont have any way of controlling the
: humidity/temperature, what can I do for my future layers so that they'll
: harden faster? Do you have to use more catalyst in cold temperatures or
: when the air has high moisture content?

: One other thing, A guy at a local fiberglass repair shop said to just put the
: layers on one right after the other, that it's not necessary to wait for
: them to cure. Could that be my problem?

: Thanks for the help!
: Jake