You might have to use both at once to do a hull. Most of the diaphragm pumps are limited in the amount of CFM. I'm told that for larger layups like hulls you need a minimum of 5CFM. I bought a 5 CFM cheapo rotary pump ($105) off ebay (new) and that was a mistake. Oil less is the only way to go. That **** cheapo exhausted an oil fog into the workshop. If I want to use it I have to plumb an exhaust line from the discharge to run outside. I probably will and use it for small parts. I already bought another oil less rotary (used) with higher CFM for doing larger parts.Here's what I got. A new Gast, a little one from Aerospace Composites and a used one on the left off Ebay (went really cheap). I have a few parts and bagging material but have a ways to go. Found a few websites with complete systems and/or parts to build one.
