I setout today, as it was quite hot and muggy out to enjoy being outside, to get the foam board glued down. I took off the precut pieces and labeled them so I was not trying to figure out what went where later. I went to get the caulking adhesive I had bought and turns out I didn't quite read the label right. The two tubes I got were safe for foamboard but further reading the label which I didn't do good enough I guess at the big box store said it was good for foam to wood but not foam to foam.

Either way I was set to get something done so decided to get the first layer down as it the real base and lowest point for anything on the layout. Come to find out wasn't as bad as an error as I got worked up over. That caulk goes quick and the two tubes was just enough to get the first layer down.

Question for anyone that reads this who has gone this route before is that a normal usage rate for a layout my size or was I being a bit over the top with how much I used. 

No pics and won't have time to get some more of the correct stuff till sometime this week but will post progress pics as soon as all the foam board is down.

Hope everyone had a great long weekend and still enjoying all the great work on the forum!

Kevin