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Old 02-26-2014, 11:33 AM   #1
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Spot prime long ceiling with critical light or prime whole thing?


I've had issues with spot primes on ceilings flashing through two coats of ceiling paint (SW Eminence). If there are waters stains that need to be blocked, can they be spot primed successfully or is it better to just do an entire prime coat to ensure everything is covered evenly?

BIN is some expensive stuff. If a prime coat is ideal, could one spot prime with BIN and prime coat with something like Kilz clear or Gardz to prevent flashing?

I plan on using ProMar 400 instead of the Eminence this time since I didn't think it was anything to shout about.

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Old 02-26-2014, 12:13 PM   #2
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Spot prime long ceiling with critical light or prime whole thing?


Spot priming with Bin, or any shellac based primer, will flash every time in critical light. It's just too hard and shiny, and will show through even very flat paint.

I have had good luck spotting with Bin, then spotting over it with Coverstain. A spray can of each makes it quick work.
Coverstain is dull and flat and seems to blend well sheen wise with ceiling paint.

A full prime is the safest bet of course. I would assume Gardz would even out the Bin flash like other primers will, but I haven't tried it for that purpose.

Chrisn probably knows for sure.

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Old 02-26-2014, 12:42 PM   #3
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Spot prime long ceiling with critical light or prime whole thing?


Thanks. I assumed that was the case but wanted to check. Spot priming over the spot prime…I like it. I want to experiment with that, but then I don't. This ceiling isn't HUGE but there are some very lengthy areas exposed to door light. I suppose if I did the double spot prime and it still flashed in two coats, I could still Gardz it and pray for only one more coat of 400.
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Old 02-26-2014, 05:37 PM   #4
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Spot prime long ceiling with critical light or prime whole thing?


Bin is probably over kill for water stains, I would use 123
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Old 02-26-2014, 05:59 PM   #5
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Spot prime long ceiling with critical light or prime whole thing?


I would just use two coats of Cover Stain. That has worked well for me.
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Old 02-26-2014, 08:36 PM   #6
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Spot prime long ceiling with critical light or prime whole thing?


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Bin is probably over kill for water stains, I would use 123
Actually it was 123 in the past (spot primes) with two coats of Eminence over top. Could see the flashing pretty badly where I had spot primed. Are you suggesting a base coat of 123 before paint?
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Old 02-26-2014, 11:50 PM   #7
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Spot prime long ceiling with critical light or prime whole thing?


Cover stain by itself will seal almost anything you throw at it and it won't flash
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Old 02-27-2014, 01:50 AM   #8
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Spot prime long ceiling with critical light or prime whole thing?


One coat of either cover stain( smells and it is oil) or one coat of 123 over the whole ceiling. Personally, I don't think eminence is any good, so I don't use it
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Old 02-27-2014, 08:44 AM   #9
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Spot prime long ceiling with critical light or prime whole thing?


I almost always Bin water stains but now there a a couple other options Bin Advanced good reviews and no strong smell and SW has a synthetic shellac primer.
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Old 02-27-2014, 12:31 PM   #10
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Spot prime long ceiling with critical light or prime whole thing?


In my earlier post when I suggested 2 coats of Cover Stain, I meant for spot priming. Cover Stain seems to be the best for not flashing, when spot priming.
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Old 03-03-2014, 08:57 PM   #11
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Spot prime long ceiling with critical light or prime whole thing?


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One coat of either cover stain( smells and it is oil) or one coat of 123 over the whole ceiling. Personally, I don't think eminence is any good, so I don't use it
Thanks. Yeah, I was really disappointed in Eminence. I hear 400 is good for ceilings, so I'll try it.

Looks like you and VAProPainter have differing viewpoints. I may try to spot prime with Coverstain in a can and two coats of 400 and see where that leaves me. If it flashes then I'll know I should have taken your advice and done an entire primecoat and start over. If I can avoid two separate pans and roller covers for the same surface I will try!
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Old 03-04-2014, 03:01 AM   #12
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Spot prime long ceiling with critical light or prime whole thing?


Please let us know
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Old 03-04-2014, 06:33 AM   #13
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Spot prime long ceiling with critical light or prime whole thing?


Will do. I just didn't realize there was such a difference in sheen levels for primer. Makes sense as to why 123 flashed through but Coverstain might not.
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Old 03-04-2014, 09:59 AM   #14
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Spot prime long ceiling with critical light or prime whole thing?


Something that you will notice is that the paint will dry much slower on the spots that are primed than it does on the rest. The finish over the spots will appear different for as much as an hour or two after painting because the primed spots are not a porous as the surrounding area so the finish paint will dry slower on those areas. I'm my experience, once it all dries down it will look uniform.

Yeah, let us know how it works out for you.
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Old 03-04-2014, 12:51 PM   #15
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Spot prime long ceiling with critical light or prime whole thing?


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Originally Posted by Jmayspaint View Post
Something that you will notice is that the paint will dry much slower on the spots that are primed than it does on the rest. The finish over the spots will appear different for as much as an hour or two after painting because the primed spots are not a porous as the surrounding area so the finish paint will dry slower on those areas. I'm my experience, once it all dries down it will look uniform.

Yeah, let us know how it works out for you.
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