KarlK;
I think what you need to do is go to a plastics supply source for the Glue . It's hot too ! Now this . If you are doing Butt Joints you better have the edges absolutely straight and level as to length and side to side .
In other words a sharp clear Polished edge . If your edges arent polished the glue will not flow properly and you'll have bubbles in the finished joints ! I usually deal with TAP Plastics in California , But there are others . Watch it though . Some aren't as well educated on their products as they should be . Our Museum learned this the hard way !
Tanker Builder