[Highside]

Bill,

I know this thread is a few weeks old and you may have already painted, but here's my take. I've painted 5 BOC screens and whether you spray or roll, the first coat MUST be rolled. If you spray the first coat, the fibers in the BOC will pop and you will fight it to no end until you roll.

The rolling action seems to press and glue the fibers down and the BOC becomes quite smooth. After that you can use what ever method you see fit.

Rob

 

[Highside]

All BOC isn't the same, some might have a problem with fibers wanting to pop up after priming and others might not. If fibers do pop up it is my understanding that they can be sanded down by using a medium or fine grit sanding sponge, but I have never tried this yet. Have you tried this Rob?

Here's my experience in a nutshell.

-I've only used the Roc-Lon BOC. (triple pass with a rubbery side). About $5 a yard.

-I paint on the rubbery side and STILL get fibers if I spray.

-Sanding with ANY type of medium (I've tried just about anything a former woodworker can) will produce a smoother surface....BUT, the fibers have ALWAYS returned on the next sprayed coat. My assumption is that sanding does nothing more than cut off the fiber, which then grows back with the next coat.

-One rolled coat, yes one, will lay those fibers down and essentially glue them to the fabric surface to never pop up again. This method will leave a very smooth surface to work with. No less smooth than a primer applied with a 1/4" nap roller to MDF or a wall.

I can add more detail as needed or answer any questions. Hopefully this thread will stick around and people can reference it or post to it as needed in the future.

Rob

 

[Highside]

Very interesting, I would have thought the fibers would be gone with a light sanding (like after raising the grain with a water-based stain in woodworking), but it seems not! Very good to know! I know this might not be practical for most people, but I wonder how a scraper would work? Anyway, it's easier to just roll the first coat of primer if spraying.

That's what I assumed as well. (Coming from a woodworking background). We always raised the grain on all of our cabinets and furniture, but after 4 light coats of a UPW concoction on an older version screen, it still raised the fibers on every coat.

I had decided to give up on spraying BOC so I rolled a single coat of the same "mix" and it smoothed out perfectly. I then sprayed with great success.

I think rolling lays on a much thicker coat almost like spakling would. Get into the pores so to speak.

Also, I think this can be a very practical solution to many.:T

Rob

 

[Highside]

pyro,

After you get your PJ calibrated, could you give a brief synopsis of your screen "experiments" time line?

I.E. where you started with your impressions to where you are now with your impressions.

Thanks,
Rob

P.S. What PJ do you have?

 

[Highside]

Not sure what you were looking for, but hopefully I answered it?

You answered well Daniel Son....:clap:

Not sure is you read my earlier posts but I have done 5 BOC screens and as of this writing, my current screen is none other than BOC with Kilz. This is the first time I've primed with it. I've done metallic, not metallic, N8 equivalent dark and even UPW with pearl:yikes:

It's rather coincident, but without me asking first, you answered the EXACT question I was after. You are/were, like me, very concerned about those Kilz induced gray(black) bars on top and bottom.:dontknow:

So my questions now are...

Would you still want to go to the N8.5 version?

Do whites appear to be dingy at all? (very subjective, I know)

Can you see ANY graininess or sparkles at all? (from seated position)

Did you roll or spray?

Thanks Pyro,
Rob