OSB Paint, Seams, & Sanding?

[Bigshow0003]

I have 4 x 10 sheets of 7/16" OSB hung vertically 24"OC for my interior walls. Based on searches of threads here, it appears two coats of oil based Kilz primer is a good base to start with.

However, prior to that I need to do some prep finish work. A few of my seams didn't align all that great. Any recommendations on filling those voids? Wood filler, drywall mud, or even caulk? I'm thinking I need to slap a little filler in there with a putty knife and do some light sanding.

Any thoughts or recommendations to improve those voids/seams?
Thanks!

 

[Paul_The_Builder]

When I did my walls I used paintable/sandable caulk for the seams and smoothed it with a putty knife.

I was pretty **** at first trying to get it smooth, but got sloppier as the project went on. When it was all said and done, the paint hides a lot of the imperfections, and its OSB afterall, not like you'll get a smooth drywall-like finish anyway.

 

[motorcycle79]

I know a few people who have caulked the joints. I used drywall mud and tape on joints and skim coated everything. I guess it’s how nice and how much time u want to spend.

 

[Showkey]

Just did my parts/compressor room.......one coat Kilz primer, two coats of high quality paint.
Light sanding especially on the cut edges.
No filler on the seams. If I was going to fill the seams , drywall compound no tape or chalk ( chalk would get expensive quick). I did chalk the corner seams.

 

[NUTTSGT]

I did a few of the larger seams/gaps and nail holes with the cheapest paintable caulk I could buy.

 

[Kaizen]

With that much wood I would only use caulk. It’s gonna move and crack hard material.


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[Slednut]

I put OSB on the ceiling of my patio cover, I cut 1.5" strips of OSB rounded them over and put them on the seams.

 

[Stefan S]

I caulked them with acrylic. And then primed and painted

 

[Bigshow0003]

Thanks for all the responses. Based on the opinions here and other internet research, I'm leaning towards Dap Alex Flex which appears to be a caulk spackle. Sandable, Paintable, and flexible. Seems like a viable option.

 

[Stefan S]

Thanks for all the responses. Based on the opinions here and other internet research, I'm leaning towards Dap Alex Flex which appears to be a caulk spackle. Sandable, Paintable, and flexible. Seems like a viable option.

That’s what I used

 

[mike93lx]

how are they attached? if screws, i would probably remove the worst offenders and shim them with cardboard drywall shims.

 

[Bolson32]

I had painted osb on my last garage and had intended to caulk the seems. But to be real honest, I wouldn't even bother. Leave an 1/8" gap for expansion and call it a day. Like someone else said, it's osb and it's never going to look like drywall. You can hide the seems but you're just going to look at the strands anyway.

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