I will also agree that the acetone alone is not enough. I work with Acrylic frequently and have always had such goodluck with IPS products I would never try to duplicate them. OPne of the great things about weld-on is that a properly sealed joint is stronger than the material itself.
BTW if you are assembling acrylic I would recommend using either #4 or #3. #16 is more for gap filing. The thinner varities will allow you to use the cappilary weld or the "pins" method.
The best way to get IPS products is to go to a Plastic supplier that sells acrylic. I know the ones local to me require you to have an account as they say that weld-on is a regulated and controlled product. I know that its also a no-no to ship it anymore too.
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