Well, if the temperature you are talking about is 200° Fahrenheit you should be OK even though, you will make the PR more brittle than it should and 1 hour may be sufficient, at 200° Celsius, for that amount of time, you are not going to like what you get...!:frown:
However, that is a problem that I have encounter and isn't much you can do, unless you reverse the procedure, do your castings first and then stabilise the wood/blanks. If you are going to do this, I strongly recommend you use less than half of the hardener, the blanks may take an extra day to stable enough to be de-mold and then put into a vacuum chamber, you need to reduce the PR hardness/brittleness that you will get, by putting them in an oven to cure the Juice so, the reduction of hardener in the mix will result in a "rubbery" type blank/resin when out of the pressure pot, that will not compromise the resin while in the juice but, as soon as it is put in the oven, the 90° Celsius required to set the juice will harden the blanks from rubber to solid but it won't get too brittle, just a little more that it would if it never had been in the oven.
Using maximum hardener dosages to get the resin to set quickly, is never a good idea when casting wood and Polyester resin, its adhesion capabilities are a lot inferior that the Alumilite resins, setting to quick is also the reason why many blanks never filled properly as the resin sets before it has a chance to reach those tights spots, particularly in the pot pressures are mild to low (40 to 70 PSI) however, not all pots are capable to reach more that that SAFELY so please look at the pots factory max. pressure ratings...!
I hope this helps you, some how...!
Good luck,
Cheers
George
