Successful Flame Treatment
From the Paint Chemist. When you try to paint Poly polypropylene or polyethylene the reason you can't stick to it is because it is low in polarity and the surface tension is very low. Kind of like Teflon. The paint has nothing to adhere to and it has a hard time wetting it out. One way is to prime with a CPO ,Chlorinated Polyolefin Primer. PO primer is the only thing that will adhere to PE or PP. The other is to flame treat or plasma treat. What this does is deposit a chemistry on the surface which will accept the coating. The surface tension is altered, increased, so your paint will flow and wet the surface. Functional chemical groups are deposited on the inert PE or PP surface and the paint adheres.
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