After doing the cinder block method of sheeting wing cores for a few years , I'm thinking of buying a vacuum bagging system and chucking the cinder blocks. So, I'm looking for some recommendations...I build most 1/4 scale (72"+) with an eye toward perhaps a little bigger birds one day. ACP (Aerospace Composite Products) offers two systems, one with a preset pump (7-8" Hg) and another with a variable pump (up to 20" Hg) with about a $200 difference in price. CST (The Composite Store) apparently only offers the higher end system (priced about the same as ACP's).

Some questions:

- Do I need the higher end vacuum pump or will the smaller preset unit do what I need?
- Anyone know of additional sources of vacuum bagging systems besides ACP and CST? Is there an industrial source for vacuum pumpts that might be cheaper?
- Perhaps a stupid question, but will polyurethane glues cure in a vacuum (I know they need moisture, but I don't know about air)?
- Can I use this system to vacuum-form plastic such as for home-made canopies or do I need lower vacuum than for wing sheeting?

Thanks in advance for any suggestions or input!