Both of these processes contribute to a strong weld. This roughs up the shiny surface from the molding process, and swells the plastic, loosening the long polymer chains. The solvent (acetone and MEK) molecules diffuse into and are absorbed by the surface of the PVC plastic. ![]() If you are doing severalf fittings, you can go ahead and prime everything, it's perfectly fine to prime parts ahead of time, so long as they don't get dirty before cementing. It will probably saturate the top of the can.Ĭover each surface to be welded on both parts thoroughly. This stuff runs like water and stains EVERYTHING. Pull out the applicator, which is attached to the lid, and dab it against the side of the can to let the excess run out. Most of the time, the swab is built right into the top. If it's the first time it's been opened, you might need a really big guy or a pipe wrench to break the seal. This stuff contains 13-17% Methyl Ethyl Ketone, 70-80% Acetone (dimethyl ketone), 5-10% cyclohexanone, and negligible amounts of other nasty chemicals. ![]() PVC primer cleans debris, then 'digests' the surface molecules of the PVC part, so that when the solvent/cement is applied, it can easily dissolve the outer layers. ![]() Paint primer prepares the surface and gives the paint molecules a nice material to adhere to. Primer for PVC serves almost the same purpose as priming in painting applications.
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