Input on primer type for cedar/plywood project - Router Forums
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post #1 of 23 (permalink) Old 08-08-2020, 11:52 AM Thread Starter
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Default Input on primer type for cedar/plywood project

I recently built a garden gate/garden door, it was built out of new Cedar (WRC) and the top part is ACX Exterior Plywood. Very similar to the attached picture, the round top was routed out of plywood, the rest is new cedar.

Based on my reading, an oil based primer for the Cedar and a latex based primer for the plywood is the recommended finish (topcoat will be exterior latex paint).

I was wondering if I could use just latex primer on the entire door. I do know why oil primer is recommended (stain blocking properties) but I have also read oil is a giant pain in the neck, VOC's, cleanup mess, harder to work with, mildew issues, harder to get good results.

I have been reading some contractor painter forums and at least one suggestion said latex was OK on new cedar wood.

Here is one of the quotes I have read:

On wood siding I traditionally always use exterior oil primer with latex top coats. If it is new wood then I think latex may be a better choice, if wood is old or previously painted then I think oil is the preferred choice. But that is only my opinion.

I have tried both oil and latex exterior primers and haven't seen one out perform the other in exterior applications. I do think that cheap primers don't perform as well.


Thoughts? Anyone use latex primer on new Cedar? Recommendations on product?

Thank you for any comments or opinions.
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post #2 of 23 (permalink) Old 08-08-2020, 12:31 PM
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My experience is that new ceder tends to bleed through latex paint, so it need to be sealed before painting. Might take 2 coats over the primer to eliminate that. Oil based paint over oil based primer, latex paint over latex primer.
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post #3 of 23 (permalink) Old 08-08-2020, 12:51 PM
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Oil primer on everything. In fact you can use waterborne coatings over oil primers, but not the reverse.
My experience here in the PNW is that waterbased coatings are a miserable failure for exterior use. Especially on horizontal surfaces like railing caps. Waste of money on decks and stairs.

Just my opinion
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post #4 of 23 (permalink) Old 08-08-2020, 01:26 PM
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Originally Posted by DaninVan View Post
Oil primer on everything. In fact you can use waterborne coatings over oil primers, but not the reverse.
My experience here in the PNW is that waterbased coatings are a miserable failure for exterior use. Especially on horizontal surfaces like railing caps. Waste of money on decks and stairs.

Just my opinion
Iíll be doing just that combination on my deck railings - oil primer and semigloss exterior concrete block grade latex for color.

Sorry you got it so rough in the PNW - awful lot of rain up there, huh?
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post #5 of 23 (permalink) Old 08-08-2020, 02:15 PM
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Yup...been raining off and on for the past three days...in the middle of August!
Adding insult to injury the &*&*&^%%$! that rule over us have put us on Stage 3 water conservation as of today. Pretty sure no one is watering and the lakes (watershed) are full.
https://www.scrd.ca/files/File/Admin...%20Release.pdf
This nonsense has been going on for 25+ years without a solution being implemented. Not that they haven't spent millions on studies ad nauseum.
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post #6 of 23 (permalink) Old 08-08-2020, 05:15 PM
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I haven't had that problem with the latex paint outside. My 2 story cape cod house had latex house paint on it for 43 years none ever peeled , it got painted every 5 years. I used latex house paint on outdoor furniture and it held up better than the oil based stain on the sun deck. so when I had to replace the sundeck I used house paint and solved that problem. I always bought the best name brand paint.
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post #7 of 23 (permalink) Old 08-08-2020, 06:55 PM Thread Starter
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Thanks to all who commented. Based on the comments I will use the oil base primer, that being said, see below.

Here is another example of what seems to me to be contradictory guidance (Sherwin-Williams/Exterior Oil-Based
Wood Primer application):

SURFACE PREPARATION

On woods that present potential tannin bleeding, such as redwood and cedar, Exterior Oil-Based Wood Primer can be
used. Care must be taken to determine if tannins will be activated by the solvent in the coating. To test for bleeding, coat a 4 foot by 4 foot section with the primer. If no bleeding is evident within 4 hours, proceed with complete priming. If bleeding occurs,use Exterior Latex Wood Primer.


https://www.sherwin-williams.com/doc.../035777658284/
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post #8 of 23 (permalink) Old 08-08-2020, 07:24 PM
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Originally Posted by Herb Stoops View Post
I haven't had that problem with the latex paint outside. My 2 story cape cod house had latex house paint on it for 43 years none ever peeled , it got painted every 5 years. I used latex house paint on outdoor furniture and it held up better than the oil based stain on the sun deck. so when I had to replace the sundeck I used house paint and solved that problem. I always bought the best name brand paint.
Herb
This is an obvious case of where paint quality can be depended on if we make the investment. The big box stores have all but decimated the value of latex with their lines, but the private brands do the job remarkably well. Worth paying for...

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post #9 of 23 (permalink) Old 08-08-2020, 08:57 PM
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This is an obvious case of where paint quality can be depended on if we make the investment. The big box stores have all but decimated the value of latex with their lines, but the private brands do the job remarkably well. Worth paying for...
Years ago when I couldn't afford to best paint, I did buy the generic brand and it didn't last 2 years, And before I could paint over it I spent a lot of time scraping, patching and sanding prep before I started to paint. That made me a believer in Name Brands.
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post #10 of 23 (permalink) Old 08-09-2020, 11:28 AM
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"That made me a believer in Name Brands."
-Herb

I've called (Exterior) 'Latex' paint every name in the book...
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