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What Are The Differences Between a Sealer and a Primer
- Sep 29, 2018 -

The most important difference you need to understand is that primer surfacer are intended to be sanded, and primer sealers are not.

Surfacer designs of fillers and pigments make it easier for them to solidify sand and powder. Fillers also tend to better regulate defects. Surfacers have less resin concentration and usually have higher volume solids than sealing agents. This makes the primer cut easier and prevents sandpaper blockage.

The sealer is on the other side of the spectrum. They will have smaller amounts of fillers and pigments and higher concentrations of resins. Because of higher resin content, sealers usually look smoother and less orange peel after curing. Sealers can be applied to lower film structures and coated with a layer of paint after a brief flash, which is called a wetting application. Avoiding sand milling process can ultimately save time and money to run the baking cycle.

That is to say, the sealing machine has the ability to polish, and the surface coating can be wet with the top coat. These factors may not make any difference according to the final completion requirements and equipment throughput. It is important to note that the chemical properties of the primer you use do not necessarily affect its surface or sealing properties (epoxy and polyurethane can be sealants and surfactants).

Take a moment to evaluate the primer you're using, ask yourself if it fits your factory's product type, and whether you're using it the way you want it to be.

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