I am/was having the same problem with mine so I emailed hobbypeople about it and this is what I got back:

The covering is Solarfilm. The technique we find that works best to remove bubbles is to heat the covering and get as many small bubbles as possible into a big bubble, then pop the edge of the bubble to let the trapped air escape. Now, the covering can be rubbed smooth with a rag or iron if needed.

--
Kyle Gittins, Manager

Customer Service
18480 Bandilier Cir
Fountain Valley CA 92708


I haven't tried it yet - working on a VF 66" Edge 540 - but hopefully this will take care of the problem. Otherwise maybe when (and if) the weather out here ever warms up just having it out in the heat of the sun will help it.

Hope this helps,