Tried to pour these moulds and it went pear shaped, the balsa blanks were painted with spray filler to smooth out there surface i used aerosol cavity wax as a mould release which never worked as you can see above as its all stuck in the mould. The top one was poured with one full pour of about 300ml of resin, it was so hot whilst the chemical reaction that cures the resin took place the cardboard around the mould was smoking. The second was done in three stages so as not to let the heat build up as much, however this worked the opposite and the heat of the second and third pours warped the first pour which is the surface the rubber gets poured onto.
I am going to try to put a bit work into these moulds to see if i can restore the mould surfaces, but i have another ace card up my sleeve to try before i give up.
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