Theres a special type of glue made for the gray pvc pipe that they sell in home depot, however i dont think it it clear/dries clear, which makes it easier for plumbers to see. If you really want some weld-on check ebay, there are some ~decent~ prices occasionally.
Your best bet is here http://www.tapplastics.com/shop/category.php?bid=21& They also have tons of acrilic nick-nacks http://www.tapplastics.com/shop/category.php?bid=14&PHPSESSID=20060724181739223741676
No, that's a clear jelly-ish PVC adhesive. The primer for that adhesive is purple. If anyone needs a UK source for acrylic solvent adhesives a more accessible alternative to IPS Weld-On is a product called PlasBond 65.