Replies

1. 
   BryanSayer | Aug 02, 2007 04:50pm | #1

   I always prime. Primer helps the paint adhere, as primer has good "tooth". Plus it seals any imperfections (do you have to fill any nail holes or the like?) and gives a uniform surface for the paint to adhere to.

2. 
   nikkiwood | Aug 02, 2007 05:07pm | #2

   I agree that priming is the best way to go.

   Furthermore, I would use an alkyd primer -- one formulated by the manufacturer of your top coat latex paint, to make sure the two are compatible.

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3. 
   DanH | Aug 02, 2007 05:31pm | #3

   Some years back when I repainted my house I scraped and primed the bad spots. Then, while painting, I discovered a few more bad spots, so I scraped and painted them without priming. Five years later all of those unprimed spots had flaking paint. No trouble with the paint anywhere else.

   (In other words, YES, you need to prime all bare wood.)

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4. 
   rjw | Aug 02, 2007 05:34pm | #4

   And don't forget to prime within 48-72 hours of exposing the wood.

   UV light can alter the surfaceof the wood enough to affect adhesion of the paint/primer.

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5. 
   Piffin | Aug 02, 2007 05:39pm | #5

   Primer has a much higher percentage of binder in it so it will adhere better.

   Some of the new high tech/high cost latex paints like SW Duration are "self priming" but you would still need an additional coat where you have bare wood.

    

    

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6. 
   Frankd479 | Aug 02, 2007 05:40pm | #6

   I had a similar thought as you on the priming. I always prime bare wood. Here's the thing though. If the side that is peeling is facing the south, explains the extreme heat the paint is being exposed to. I have battled this with an old 1780's home that has no sheathing behind the siding. I scraped and wiped down where I scraped with bleach on a rag. This helps get off any chaulking that may be left on the wood that may affect proper adhesion of the primer. He gets a few years before the peeling occurs again, but I believe it is the extreme heat and lack of any back priming of the siding that is allowing moisture to get in behind the wood and when the sun hits that south side, it (steams) off the paint. You may want to try using an oil base paint if the peeling continues. Good Luck, Frank