Priming before you paint can make a world of difference on the outcome of your paint job. Please remember to read all label directions as not all projects recommend the use of a primer. These may include surfaces such as painting a floor or staining a deck.
What can be so important about priming a surface? Primers serve two major functions: they seal porous materials so the topcoat won't dry with an uneven appearance and they aid the topcoat in bonding properly with the surface underneath.
The two main types of primers are primer-sealers and undercoaters. Unpainted surfaces, or surfaces where most of the original paint has been removed call for a primer sealer. Undercoaters should be used to form a bond between coats of paint.
Know your surface and choose the primer accordingly. For standard drywall surfaces, latex primers are better because they don't raise the nap or fibers on the surface of the wall board. For plaster surfaces, a latex or alkyd primer can be used. Alkyd undercoats are appropriate for wood trim.
For best results when painting over wallpaper, use an alkyd primer or alkyd primer/undercoater to seal potential bleedthrough and seals.
Once you have selected and applied the appropriate primer, you are ready to paint a topcoat. And because you took the time to prime, your finished paint job will be more attractive now and in the future.
Dave - 360renos
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