sometimes you just want to get the job done......In this case, I'm laminating both of the small triangular bulkheads that were cut from foam using the cardboard templates ( see last post)

If you do the simple math, 4 old salvage trojan battery's don't even come close to providing the compressive forces that can be generated by vac bagging. However, in this case,  knocking the job out quick takes precedence.

Just for kicks, you can see my Ryobi drill which has become the  master epoxy mixer. It's not such a good drill but it works just fine for mixing batches of epoxy.