Stain Blocking Primers

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Universal primers are very basic surface preparation products that every painter keeps on the truck and uses almost everyday. These primers are known as ** "universal" primers which means that they are 1.Primers: they provide good adhesion to "hard to grip" to surfaces, 2. Sealers:

Universal Primers - part 1

they seal the substrate preventing the top coat from soaking into the substrate. A sealed surface will provide good sheen uniformity of the top coat. 3. Enamel undercoaters: as previously mentioned, universal primers provide for a uniform appearance of enamels applied over them. And finally they are 4. Stain blockers: they will lock in stains preventing the stain from bleeding into the top coat. The stain "kill" aspect is not the same for each type of these primers, some work best for water soluble stains and others work best for greasy / oily stains. etc.... Also one primer is better for interior and another is better for exterior surfaces. 5. Fast drying: all universal primers have fast dry and re-coat capability. It is because of this that all three types of universal primers are ussually kept on the well stocked truck of the smart painting contractor.

The Basics: As mentioned already there are three types of universal primers. There are oil based , water based and shellac based versions of these primers.

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Zinsser is my favorite brand of stain kill primer. Zinsser makes oil (Coverstain), latex (123 Bullseye) and shellac (BIN) stain kill primers. What I appriciate about the Zinsser primers is the adhesion of the primers, fast dry and good stain kill properties. These primers are resonsoablly priced too.

Another brand of high performing universal primers is Xim brand primers. Known for their exceptional adhesion when used according to the manufacture's label and instructions. This brand will probably cost a bit more than Zinsser but for high performance needs - this is the brand I use in these situations.

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** "universal" means basically "good for almost every priming sitiuation.

Starting with the Shellac primer which is a favorite of mine for a variety of reasons. Some of the primary benefits of shellac are it's quick dry and strong adhesion. Shellac primer will dry in about 15 - 30 minutes making re-coating very quick - an important point for painters. Shellac primers are re-coatable with latex or oil paints. Shellac is the best of the universal primers for sealing the underlying substrate and providing the best enamel hold out and uniformity.

Shellac also has very good adhesion to glossy surfaces but unlike oil which is a little forgiving , the surface must be very clean in order for shellac to develop adhesion. Another point to remember with shellac is that is will not "wet the surface" or adhere if the surface is a little dusty, I don't use shellac for spackle spots for this reason as oil will wet the surface better (never paint directly over dust, either vacuum, or wipe off with a rag or dusting brush to remove all dust first before priming ).

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