I’m using a “Moisture resistant Polyethylene Film, 0.004” thick" for my bag. I bought it from McMaster Carr. It seems relatively heavy duty. I do not have to put any peel ply over the spiral tubing to prevent tearing, which is nice. On small parts and test panels this work out great. On larger pieces, I always seem to have few holes in the bag. I noticed that the material right off the roll seems to have grit in/on it. I suppose the grade that I’m using isn’t meant for air tight applications. Either way I’m returning it and I’m going to purchase something to replace it. The holes are impossible to find before the infusion starts. I’ve been lucky enough to find the holes very quickly once I start the infusion and plug them with some tape. No parts have been ruined yet, luckily.
I’ll be working in room temperature, with epoxy resin. Any suggestions for a bagging film that I won’t have to worry about tiny holes in my bag?