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Toulene glue substitute

A light assembly plant is currently assembling styrene floats for the water
softner industry.  The floats are made up of two halves, with the bottom
half containing sand as a ballast.  Currently, the assembler utilizes a glue
containing 80-90% toulene and 10-20% sytrene crystals to seal the two halves

He has tested sonic welding, but because of the difficulty rotating the
sand-containing float, has not achieved very good results. He is also
currently testing using a PVC primer for the seal.

Does anyone have experience with thermal welding which would seem to be a
logical alternative to the glue process?  Other suggestions are of course
welcome, since the manufacturer is highly motivated to eliminate his current
glue process.  Thanks.

Steve Brachman
Waste Reduction & Management Specialist
UW-Extension Solid & Hazardous Waste Education Center
161 W. Wisconsin Ave., Suite 6000
Milwaukee, WI 53203
PH: (414) 227-3160  FAX: (414) 227-3165