Hmmm after some more searching it appears fiberglass will not bond to plastic...well. I can't understand why I see people using PVC for tweeter cups in pillars? Are they asking for problems with cracking and separation down the road? And at the same time stretching fabric onto the same pillars to form them with the cups.

Can someone enlighten me?

 

polyester will stick relatively well to pvc, with proper preparation, but not delrin(nylon)...it just wont .

scuff the pvc, drill tiny holes(extreme adhesion applications) and wipe down the surface with a rag with acetone on it.

hope this helps

 

From what most people say, epoxy resin will stick much better to plastics. I haven't had a chance to try it myself yet but plan to in the spring.

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Here is the one I've heard a few people talk about that works really well http://www.uscomposites.com/epoxy.html

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Right on! Thanks for the info!

 

Clean it BEFORE you sand it. Very important! Otherwise you will just grind all of the oils and mold release agents into the plastic. Acetone will work but keep in mind that it will eat away at some plastics. Denatured alcohol works well too. One other thing, stay away from a product called Bulldog plastic adhesion promotor. This stuff sucks in my opinion. I've had problems with it as well as another friend on mine on here. Drilling the holes that was suggested earlier in this thread is definately a good idea. That will help a lot.

 

Acetone, actually makes the surface of pvc dull and slightly porous. as long as the part isn't soaked, the solvent will evaporate before softening up the part.

 

This is more of a 'continuance of the original question
I just laid a PVC floor mural on my bathroom floor and wanted to put a layer of Polyurethane or epoxy down for depth and shine, but the company says it wont stick to the PVC does anyone know WHAT might give the same results?
Thanks
Dr.B

 

This is site is becoming an absolute ****ing joke...