There are two other instances that I want to discuss where you will need to use a primer when painting interiors. Adhesion and paint hide and coverage have already been discussed in part one. You will also need to prime when you want:
3. To seal the underlying surface:
Water sensitive substances
The most common scenario for priming here is after wallpaper removal. Any glue residue on the surface will interfere with good film formation of a latex paint if applied over the top. To seal off the surface after wallpaper removal an alkyd or shellac primer sealer is used to prevent re-wetting of any glue residue left behind after removal.
Used for interiors only, it probably blocks the widest variety of stains better than the other two. If you don't know which one to buy for your stain blocking - buy the shellac and you will probably have the right one. Zinsser's BIN is the most commonly used shellac stain blocker used by paint contractors for good reason - it works.
4. To block or seal bleeding stains
Stain blocking primers or "stain kills" are regularly needed in interior painting. In fact, many of the stain blocking primers are considered to be "universal primers" which bond, seal and block stains. These primers are a mainstay of most paint contractors and are kept on the truck and handy, ready to be used.
There are three types of stain blocking primers: alkyd, shellac and waterbased. Each of the stain blockers are better for blocking different stains.
For instance, the waterbased stain blocker does not block water soluble stains as well as would an alkyd stain blocker. Solvent activated tar type stains are better blocked by a waterbased primer. Probably the best of the stain blockers is the shellac type.
New wood or drywall
New surfaces such as new wood trim or drywall need to be sealed to a uniform porosity so that the finish paint will not be absorbed into the substrate which would result in an uneven film build and uneven sheen of the finish paint. Primers are formulated to seal raw surfaces and provide a ideal re-coatable surface for the finish paint.
New drywall is usually painted with a PVA ( poly vinyl acrylic ) latex primer.
These primers are formulated to seal the porous drywall and joint compounds providing for good sheen uniformity of the finish paint.New interior wood trim is best primed with alkyd or shellac primers. Waterbased primers tend to raise the wood grain and cause it to swell.
Drywall Tools
The Internet Paint Store
dustless sanders
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HEPA Vacuums
Tools and Attachments
Bearter Bar Floor Tools
The Internet Paint Store.com
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Interior Paint Primers:
When Do You Need To Use Them?
part 2
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