What i did is i put my gm and ao's on a plate (glass) and glue it. the end that was facing the plate turned out great. the other side was ok. pics :
Agent Orange: (not the side facing glass plate)
What I did with mine was put the wheel on top of some baking paper so the glue doesn't stick to it. Then fill up the wheel with glue and once it was at the top put some more baking paper over the top of the wheel to flatten out the glue.
. no lie.