OSB painting again

[Bear]

So - we have had many threads on how to/what to paint/primer with and I did a search but did not find anything. (guess I don't know how)

I am doing osb smooth side out on the inside of the shop and plan to paint with latex. I know standard dry wall stats are 350 to 400sf but every one says osb ***** paint. The question is "How many sq. ft. of fresh osb will a gallon cover"?

Thanks

 

[JohnK007]

My garage is approx 20 X 22. I used 2 to 3 gallons of Kilz primer (water base) and about a gallon and a half of paint. The OSB will really **** up the primer. Once that's on the paint isn't so bad. Start by getting 2 gallons of primer but don't be surprised if you have to run out for another gallon.

 

[Onecat]

I just did my 26x26x10 garage. I used and would suggest using an oil based primer and then use whatever paint for a topcoat. I used about 3.5 gallons of Sherwin-Williams oil based primer. I bought 5 gal. on sale for about $100. I have some other painting projects, so the leftover won't go to waste. I followed that with 2 coats of SW Promar latex paint. I used about 4 gal. of paint, but I put it on really heavy. I was happy with the outcome.

One thing that I did and would suggest to anyone planning to paint osb, is to do a test board first. I painted a piece of scrap using different scenarios (1 vs 2 coats of primer, etc.). That way you should be able to find out what works best for you and achieve the results you want.

If using a roller to apply, I would suggest using at least a 1/2 inch nap roller. The longer nap works better IMO.

Dan

 

[Gary S]

I used and would suggest using an oil based primer and then use whatever paint for a topcoat.

Agreed. If you use an oil based primer, it doesn't soak into the OSB like water based does, so you use a lot less primer and get a better seal. With an oil based primer, you should need only one coat of paint to get good coverage.

 

[Onecat]

Agreed. If you use an oil based primer, it doesn't soak into the OSB like water based does, so you use a lot less primer and get a better seal. With an oil based primer, you should need only one coat of paint to get good coverage.

True, I did achieve adequate coverage with one coat of paint. However, the second coat hid the flake of the osb better.

Dan

 

[JohnK007]

Yeah, I'll agree with the above statements concerning oil base being better than water. I was already committed to the water base however, and in hindsight I can see the truth of the argument in using oil.

 

[dirttracker18]

Don't use paint use a white (or insert your colour here) wood stain instead.

Two coats to completely cover my OSB walls.

 

[NUTTSGT]

I used zero gallons of paint. I used all primer on my OSB, Kilz oil based, 2 coats and bought a 5 gallon pail.

Between the ceilings, repainting part of the walls and a few other things, I used a total of 10 gallons.

 

[Bear]

Thanks guys - sounds like a gallon will do about 100 to 150 sq ft so I'm looking at a bunch for my 22x40x9 area.

 

[Falcon67]

This is fresh info, since we just finished the old house repair for sell. I put a lot of MDF paneling in the house and sanded it before gluing to to the wall. One coat of Valspar All Purpose Primer and then at least one coat of color. We used the good grade of Kelly-Moore interior flat in a light chocolate brown color, and that shows errors like crazy. Sanded MDF panel ***** paint like a sponge and without primer you are looking at 3 coats to get solid coverage. We did one wall section sans primer and that's when we switched to the primer before paint. The Valspar stuff sticks to anything (skin especially) and works very well for the price. We had a little bit of trouble with final coat coverage on some existing paneling that had been in the house for at least 30 years but the MDF was one coat + one coat. If I go OSB in the new shop, I would think the same apply will work. I'll use white which works great with the white Valspar, but I'll bet they can tint the primer if you like to get more mileage out of your color coat.

Edit - it also helps to primer bare drywall as that paper ***** color coat.

 

[Zeke]

I think you can get 200 sq ft/gal in a long run. You always lose some in the clean up, so short runs might take a little more. If you can find "undercoater," it builds higher and hides better. I have yet to find a Kilz or Zinser product I like.

I'm an ex union trained painter. Got out of the biz back when materials were good stuff.

 

[babzog]

I used the cheapest paint I could find at HD. I had about half a 5gal pail of Kilz latex primer left over from house painting then I bought a 5gal pail of white semi-gloss (think it was about $70). When I did the ceiling, I used one coat of primer followed by two coats of semi-gloss and it looks great! All the black lettering on the OSB is completely covered - the only part I was concerned about.

Shop is 20x24 and I've got lots of paint left. I might buy a second colour when I start on the walls but I'm still undecided about all white or two-tone.

 

[Shocker]

I used the oil based Kilz. 24x36 shop 10 foot ceilings. Took about 2 gallons total then about 3 gallons of Walmart semi gloss. Looks great.

 

[scuba0459]

I used kiltz, two coats, the first one real light as the black writing would bleed thru. I then painted the walls and they turned out great. This is on my car garage. On my workshop I went with drywall.

 

[6th Gear]

I bought a 5 gal bucket of Killz oil based and it was thicker than the same stuff I used a few years ago. I used a 1/2" nap roller and one coat was a little blotchy & the black writing was still noticeable thru the paint. The second coat made it a solid white and looks great! I'm not even going to bother with another coat of exterior latex paint on top, just 2 coats of Killz looks great!