Let me explain some reasons why I stated what I did about long term issues.
I read all over this place for nine months primarily studying the weight reduction and how the sandwich core method works and has its strength. We have 2 factors here to consider for the outside as well as inside strengths. Adhesion and stiffness are what makes the sandwich strong so if you don't balance those things you trade off and add to the shell strength and shorten the life of the overall bond or take away from the shell strength and lengthen the life of the bond.
Mike found that certain paints provided much better adhesion for the canvas to the foam which is a great thing but if he doesn't follow that with strengthening the chelle (pun) lol then he makes the shell more subsceptible to failure under stress (towing or hitting something being the main factors).
The glue shell is harder and thus provides the shell strength but is greatly lacking in the adhesion department. TB3 dries very hard and is much better rated than TB2 is why I suggested using it and it isn't really that much more when you think of long term aspects of the life of the camper. I literally build one and plan for it to last 40 yrs if properly cared for. I can walk on the roof of the one in the picture above and it has 3/4" sandwich walls and 1 1/2" sandwich roof using the 30NF and TB3 as the only glues.
Tensile strength and shear strength provide your success with the sandwich construction which is what the foamie really is with just very little wood or other substance added for stiffening the walls.
The microcamper above is 1400 pounds and strong as a tank pretty much and with a 3500 lb axle can be loaded for "bear" lol (see I have read all this). Its hard to get people not on this forum and building these things to understand how good a deal I have at the 7k price with all the options included when all my competitors are 10k and up for the same things in a teardrop package.
You guys get the feeling when I walk out and look at the camper and go man that is bad ass and I built it.......my hats off to all you builders this stuff is fun huh and I get to do it for a living lol
