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Can you send me the link from that Page? weird IPS would say that and the weldon page its self doesn't even mention acrylic under 5 and in fact points to extruded plastics not acrylic.
as for crazing, I think this is a rumor created from companies trying to justify there price of there products because the chose to go with cell cast for better looks. extruded doesn't crazy because of the glue or because it is extruded, it crazes for the same reason as cast, stress points caused by gluing edges that were not done properly or precise enuf. the major cause is using the wrong types of blades to cut acrylic, not getting a flat edge and flame polishing.
Steve
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Here is the IPS link.
I found out about Weldon 5 when doing some work with Lexan MR10. I called their tech support and drilled him with a bunch of questions. I am not completley sold on your crazing theory, but you may be right. A theory I came up with may be ther slower setting time with the Weldon 5. Perhaps it doesn't shrink as much when drying. Thus reducing the stress on the joint. This is just coming out of my butt as I type, so I may be way off.
The weldon 5 bottle also has in big type that is is meant for extruded acrylic. I have leant the glue to another reefer, or I would take a picture.
http://www.ipscorp.com/ind_html/acrylics.html
Cheers,
Al