Zealot

Let me first give you an example

I have printet out the first part of the Digital navy's Admirable. Then I cut out some of the parts and glue it on some thicker papper(cardboard) But here come's the problem. The cardboard bends and looks like a bowl( as seen from the side). First I thought it was the quantity and the type of glue I used. Therefor I tried out different type of papperglue and I even tried out the quantity of it, to see if that would help and no it did not.

So how can I prevent this from happen

Markus