First off....forget all about the oven. If you mix the resin to the proper ratio it is going to dry the way it is supposed to. Heating it will cause it to warp and be brittle. Your orange resin shows you that. Air bubles need to be ground out and filled. You need to take your time laying out the matt and throughly saturate the material. You can tell that is correct because it will take on the color of the material underneath and have an even color flow...white spots are air bubbles.
Just a little info. I was using grill cloth and such 12 years ago to make pods, enclosures, and such. It is not the material to use. It takes to long to build up and is too wavy. Using fleece you can cut your times in half. I built these start to finish including the base coat/clear coat in one day.