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Old 03-02-2015, 01:40 PM
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RBACONS
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PAM cooking spray works well in a pinch for a mold release. Spray on lightly and wipe off excess. However, a couple of coats of a good paste wax should have been sufficient.

Whether or not you join the mold halves and then do your lay up or lay up each half and then join them primarily depends on what you're molding. Wheel pants would be very difficult to lay up with the mold halves joined because you would be working through a very small opening. With a cowl, joining the mold halves first should not be a problem as long as you can align them properly. Usually alignment keys are created in the mold halves when the mold is being made so that the halves go back together perfectly. It does yield a better finished product (no seam to clean up and perfect alignment).

Vacuum bagging works better on flat or convex surfaces like a wing. It would difficult if not impossible to get the vacuum bag to conform smoothly the compound, concave curves of the inner surface of the cowl layup.