Spot priming is exactly what it sounds like. It's the action of only priming spots that need to be. In the case with painting a home it would be all the bare wood areas after the scraping has been done. When a home is being prepared to be painted scraping has to be done. Scraping will reveal the worst peeling and chipping areas. This makes the spot priming easier and tells you where it's needed. A situation when spot priming would be used would be when you're painting the same color on the home and just need to touch a few spots up because you're only doing one coat. Another case would be spot priming an area that has a stain rather than the entire surface area. A good primer to use for these situations would be a high bonding primer. Preferrable something thicker than paint meant for spot priming.
Priming and spot priming are very important steps that cannot be skipped because it's essentially your first layer of protection. Bare areas are more vulnerable to the elements and to get the best result as possible a primer should be applied before paint. This not only promotes adhesion and bonding to the wood but is the foundation of the paint being applied. Without primer, areas peel and chip faster, collect moisture and overall don't last or look as good. This can lead to rotted wood or even worse internal damage to the home. Before priming make sure you're using the right product for the job. Anyone at the paint store should be able to briefly educate you on what to use. Some links are listed below on good primers for this kind of work. Remember if you want the hard work to last, prime bare areas with the right product and don't forget to give it 2 coats of paint after that!
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