Acrylic....little help??

[Cujo#31]

Is there ANYONE that actually knows how to do acrylic? I have taken the advice of many "experts lately with the same disappointing results. No matter how I prep my edges I'm getting crazing in my welds. Cutting the project apart for the second time tomorrow. It's thick acrylic, 1" sides and 1 1/4"front and back.