Conventional wisdom says that PVC can not be painted. Is that argumentative statement?

The fact that PVC is difficult to dye. The reason is that plastic has a low energy on the surface. All materials and fluids have a "surface energy" and now we will talk about how it relates to the PVC.

Surface Energy

Since water has a higher surface energy (surface energy, SE) of PVC, droplets of water will slip. To make the water "held" on PVC, his energy surface must be treated to SE rose above the water. The average consumer can do two things to increase SE PVC, of ​​which the first to inflict a little lightly sand the surface. This will remove the surface as the wax and create more space for water. Another way to raise the SE is to be wiped PVC acetone. Acetone is harmful to PVC. If he's wearing PVC in acetone, it would undermine the molecular structure of time and destroyed PVC joinery. This, however, can be an advantage when preparing PVC painting. Acetone does two things: it allows surfaces to swell the ranks of little porous, and (2) is sprayed on the surface waxes that are inherent therein. So, acetone will also raise the SE-a.pvc PVC joinery Even if the consumer prepares the surface as described, SE PVC will never reach the water SE (with this technique) due waxes that are external and internal in PVC-u. To combat this, the paint made from a mixture of acrylic and polyurethane (latex paint) are made with additives to reduce fear. These additives reduce SE PVC colors lower than the untreated PVC SE.

Theory and practice - PVC joinery

In theory, he would not have treated PVC if the color has energy below the surface of the PVC, but there is a problem with the theory ... but this is the reality. The empirical results suggest the combination of good surface preparation and paint with low SE which can lead to good priajanjanja colors on PVC-u.

There are many more than that, because the paint composition is actually chemistry. Each micro-ingredient and any change in pigmentation can change the color of liquid adhesion to PVC surface, but it is beyond the scope of this article because it is in the field of chemistry as a science. Exposure to PVC flame is another process that PVC can be painted. Thus, "all in all PVC can be painted or it must be properly prepared or treated with colors that are designed specifically for this use.