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Discussion Starter · #1 ·
So we have a media room, and my designer acted like we would hate black if we also used it as an office, so she recommended "Peppercorn" by sherwin williams. That ended up looking really bad, so we switched to black.


I used Duration in a matte finish, black magic color. It covered well, but when the sunlight hit it, it was streaked. I couldn't figure out how to paint it on properly, so the local store recommended going with Promar-400 in flat black.


I thought it would be ok, but I have four coats on it so far, and I still see streaks when sunlight reflects off of it. It looks ok at night with lights but sunlight looks really bad reflecting off of it.


Anyway, any ideas? Best I can figure at this point is that I need to be adamant about smoothing strokes in the same direction. Otherwise i don't know what my problem is other than I should have reprimed, in which the local store said I wouldn't have to do.


It's aggravating because at this point I have a coat of darkened primer, two coats of Peppercorn in Cashmere, two coats Duration in matte, and four coats of Pro-Mar 400 in flat black. Can't seem to make it look right and need to figure out if I need to continue down this path of putting more coats on or what. It looks great except when sunlight hits it. I can't figure that part out.
 

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Are you rolling it? Could you spray it?
 

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How thick of a nap are you using? If it's too think it will put too much paint on and make it hard to smooth out. I use 3/8" for smooth surfaces. Make sure you work into wet edges and use long strokes. Don't overwork it...as the paint comes off the roller and it starts to get dry and you overwork it, the roller will start to pic UP paint off the surface.
 

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Discussion Starter · #5 ·
I was using 3/8" Purdy White Dove on both the smooth walls and knock-down ceiling. The last coat I put a 1/2" one on for the ceiling only. Once I start up on the walls again I will try a 1/4" nap. My problem right now is the ceiling.
 

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3/8 is standard, I used 1/4 and it would probably work for you since you already have so many coats on.


Are you accustomed to painting? It sounds like you may have roller marks. A shorter nap will help avoid paint trailing off the edge of the roller, but unless you're cognoscente of what roller marks are, you will still make them regardless of the nap.


If you know what roller marks are, disregard this message. Black is a b--ch to paint



Tim
 

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Discussion Starter · #7 ·
I know what typical roller marks are where you squeeze it too hard and paint comes out the end. I don't do that. My problem is that the sheen is different. It has more to do with flashing than paint squeezing out the end of the roller cover. Best I can tell is to paint more "M" and "W" patterns then do a big smoothing sweep after that. It's just annoying when I specifically ask the manager at Sherwin Williams about this and he acts like that's totally unnecessary and therefore there must be something else going on.
 

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I painted a DIY screen wall some time ago. I found the trick to getting a consistent sheen was to roll in several coats, alternatiing the rolling pattern between typical vertical (W/M patterns) and horizontal (side to side) patterns. The last two coats were rolled with very light pressure and the end result looks like it was sprayed.
 

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Discussion Starter · #10 ·
So, this may be yet another BS story, but the sherwin williams manager talked to tech support and got back to me. He said basically I put on some coats before it was fully cured, so it like sealed in the moisture, and led to an effect they call "mirroring". He said to let it cure for 2 months, then try again with the Pro-Mar 400, and I should get tons better results.
 

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If you have established paint ridges, you may consider sanding or somehow knocking down the lines until you have a smooth starting surface again. I'd give you two tips (in addition to that given above) when you go for another coat to smooth out the sheen: 1. Mix in the appropriate amount of Flotrol in with your paint to extend the open time considerably and keep the wet edge; 2. All professional painters use what is called a "finishing stroke" to get the sheen to line up. This means that you roll over the entire ceiling in a single stroke in the same direction. In other words, start your roller at one end of the room and roll to the other end of the room keeping as straight as possible. Once at the other side of the room, lift the roller and walk back to the front and start the finishing stroke for the next row, etc. until you have physically rolled over the entire room in the same direction (using light pressure) then walk away until it dries. You should notice a huge difference. Good luck!
 

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Discussion Starter · #13 ·
Just wanted to let everybody know that I figured out what the problem is. It's Sherwin Williams. I went to the Home Depot and got their Behr premium flat interior paint (not the kind with primer) and it is now velvety smooth. HUGE difference.
 

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Strange indeed. I started with Lowes black and it didn't cover worth a darn, with lots of roller marks. Switched to Sherwin Williams ProMar400 (mixed flat black from the factory) and it was GREAT. I gave it 2 coats to completely cover the Lowes paint and it's a blck hole of a ceilling. I found it interesting that the guy at Sherwin Williams told me after I requested him to fill the can with black pigment (I wanted the darkest possible) that over pigmenting paint will make a trerrible uniformity to the finished surface. He suggested the pre-tinted ProMar400 and it worked great for me.


Glad you got your problem sorted.
 

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Discussion Starter · #16 ·
I'd say it was just me, except it was multiple SW products, and the drying time and thickness of the 400 is nowhere near the same as the Behr. The 400... I got six coats on the ceiling with 1.5 gallons, and just threw the rest away due to being disappointed, and after every coat I was covered in black paint due to so much spatter. It is extremely thin and dries too fast. The Behr was much thicker, took much longer to dry, didn't have any spatter, and was totally uniform after one coat, which used up most of an entire gallon. Huge difference.
 

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Quote:
Just wanted to let everybody know that I figured out what the problem is. It's Sherwin Williams.

I'm not surprised. I worked at a Sherwin Williams paint factory right out of High School. I lucked out on the day shift at the end of the line putting complete cartons onto pallets to be taken into the warehouse. A buddy of mine (right out of High School) worked the late shift actually mixing the paint batches. One day I'm loading cartons and some supervisors come running in yelling, "STOP! STOP!....How many pallets went through? We HAVE to get them back!" Turns out, my buddy, who was supposed to put 5 pounds of the drying compound into the mix dumped in a whole FIFTY pound bag. Later I was asking one of the chemists that test every batch what happened and after he told me he said, "that paint was dry before it even got on the wall!"
 
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