I just got done bagging the foam parts for my plane. A couple of us got together and bought the ACP system. Works very well. I had a lot of questions myself but my friend did two planes with the pump before me and helped me out. A suggestion that Al gave me that I'll pass on is that you first do a "dry run". Vacuum down everything without glue to make sure there are no surprises.

When you're ready make sure you have everything ready to go. Enough glue, wax paper, a place to set the buttered up sheet while your working on the other one. Also mark a line on the sheeting and core with a bright colored marker so you can see that the sheets didn't shift while looking through the bag. When doing a Carden as Dick mentioned, one of the shucks is marked "down". This is the trued piece so this piece goes under the bag to keep the wing straight. Just for clarification, you make a sandwich with the upper and lower sheets as the bread and the foam being the meat (Analogy borrowed from Rob T. ). This sandwich goes in the bag as it is. Then you vacuum it down. Once it pulls full vacuum, place the trued shuck underneath the bag and put weights on the top, evenly distributed, to make sure the wing sits correctly in the bottom schuck. Keep in mind, just like with weights it's dire important to have a FLAT building surface. It doesn't take a lot of weight, just enough to push the wing flat into the bottom shuck.

Another tip I'd mention is to only leave about a 1/4 to 3/8" overhang. This is again why you want to have a mark to make sure the sheets are on correctly.

Hope this helps.

..............Mark