What that means is they cannot be solvent bonded like say acrylic, PVC, ABS, styrene, polycarbonate can. And for the same (molecular) reason, they are very difficult to bond with most all glues including epoxy... in fact even ink and paint won't stick very well. If you can oxydiz...
Primer is almost always purple in color and should be used to prepare the surfaces that will receive the PVC cement. There are some people that say that using primer isn’t generally needed with brand new pipe, and that it’s made to help out plumbers in a hurry who might not be able...