I would use 3-4 layers if you have compound curves. They give stiffness to the part. Try to avoid large flat areas, since they will flex more without foam core support.
On Jan 25, 2006, at 5:46 PM, John Downing wrote:
I have the 8.9 oz. e glass cloth, how many layers of this material are you fellows using on the radiators and the oil cooler diffusers. Having never worked with fiber glass until last week, I'm mostly learning how to redo things up to this point. A fellow donated a cowl for the Tailwind and I have been reworking it to clear the oil cooler and adding on the rear because of a 2 1/2" prop extension needed to get the evaporators in place. Thank you. JohnD