I need help in covering over covering tips. I've covered a few kits but haven't done much covering over covering as in stripes or designs, etc. The few times I have it seems that I get air pockets between the covering. How do you prevent that? Also, any other covering tips would be helpful. I'm building a hog bipe and astro hog next and want to add some designs to them instead of just solid colors like I have done in the past. Any comments would be helpful.