Spot primer showing through paint

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Old 02-05-16, 08:12 AM
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Spot primer showing through paint

Hi

I originally had a white painted wall but there where stains such as crayon, pen and grazing from furniture. I spot primed the stains with zinsser and left to dry. I have applied two coats of white emulsion paint and I am still seeing the patches where I spot primed showing through??? Can anyone advice?? Do I need another coat??


Thanks
 
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Old 02-05-16, 08:36 AM
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Welcome to the forums!

Was the touch up paint mixed well? it isn't uncommon for the pigments to sink to the bottom of the bucket. Because the solvent based primer seals the substrate it can take longer for the paint to dry and may take an additional coat but it still should cover with 2 coats.
 
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Old 02-05-16, 08:49 AM
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Which Zinsser primer did you use?
 
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Old 02-05-16, 08:49 AM
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Hi thanks for the reply. It was mixed fine. I recently applied the second coat a few hours ago but I am still seeing patches. I do t know if I need to give it a while to dry?
 
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Old 02-05-16, 08:52 AM
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I used Zinsser Bin White Primer & Undercoat 1L
 
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Old 02-05-16, 08:55 AM
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Give it the rest of the day to dry and see if it blends in. Exactly what paint are you using for the top coat? I assume it's the same [leftover] paint the wall was painted with previously.
 
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Old 02-05-16, 09:00 AM
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It's a new house so I have no idea what paint was used before. I am using dulux matt emulsion brilliant white paint.
 
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Old 02-05-16, 09:06 AM
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There is probably a 100 different shades/sheens of white paint. If you don't have the same brand/line/formula of paint - it will not touch up! Is it a brand new house or just new to you? If new construction the builder/painter often uses the same paint on all the houses so it's usually not to hard to find out what was used. Short of that, you need to repaint the entire wall.
 
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Old 02-05-16, 09:30 AM
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I have just moved in to the house. The rest of the wall has covered completely fine. It is only where I spot primed that is showing through. Why would the primer show through?
 
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Old 02-05-16, 09:32 AM
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The BIN primer sealed that portion of the wall better than the latex primer and paint has. Because it's sealed better fresh paint doesn't cover as well and takes longer to dry.
 
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Old 02-05-16, 09:39 AM
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So is the best option to wait for the second coat to dry fully. Secondly if the spot is showing through can I just spot recoat where the primer shows through and leave the rest of the wall?
 
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Old 02-05-16, 10:31 AM
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I agree that the primer patches take longer to dry. That is why when I checked the wall after a few hours the rest of the wall seemed dry but the primer patches were still a bright white. Makes sense now
 
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Old 02-05-16, 02:12 PM
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Did your touch up blend in nicely where you didn't prime?

While I've used Dulux coatings in the past I've not used a lot of it and not overly familiar with their coatings. I assume since it's an emulsion paint it's at or near the bottom of their product lines.
 
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Old 02-05-16, 02:42 PM
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I blended the areas in nice where I didn't prime. Can I spot paint over the primed areas if they are still showing or will that make it stand out more compare to the rest of the wall, or should I only paint the areas that are not primed?
 
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Old 02-05-16, 02:55 PM
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I'd try another coat of paint over the primed areas. It sounds like the primer might be preventing full coverage [the wall can't suck up the paint like the unprimed areas]
 
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Old 02-05-16, 03:03 PM
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Thanks. Just to confirm I only need to put an extra coat on the primed areas and ignore the rest?
 
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Old 02-05-16, 08:48 PM
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Maybe. Some paints touch up better than others so sometimes you can spot paint and sometimes you end up doing the whole wall once you've realized it isn't going to touch up well for you.
 
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Old 02-06-16, 01:06 AM
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I am using a sheepskin roller which gives me better coverage and a smooth finish. I have read that these are more suited to textured walls. Should I change the roller or is it ok to continue using it?
 
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Old 02-06-16, 03:00 AM
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I rarely use anything but a lambswool cover. They disperse the paint better and clean up easier than the synthetic covers along with having less roller spray. I doubt changing roller covers would make any difference. What size nap is it? what type of texture is on the wall?
 
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Old 02-06-16, 03:06 AM
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It's long pile 230mm. The wall is a smooth flat surface but I have found the roller covers it well and gives me a really good smooth finish
 
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Old 02-06-16, 03:27 AM
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I'm not well versed on the metric system but a google search says 230 mm is 9" .... or maybe you are referring to the width [9" is standard] what is the thickness of the cover? I normally use a 1/2" nap for smooth or lightly textured walls.
 
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Old 02-06-16, 03:40 AM
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I think it's 3/4 from the top of my head
 
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Old 02-06-16, 03:44 AM
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That's a little big for a smooth wall but should still work. How much are you rolling it? Was the cover well saturated with paint? Depending on how you are using it, it's possible that you are putting the paint on and then pulling some it back off with the long nap.
 
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Old 02-06-16, 03:58 AM
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I'm covering it well. I start in one section and spread the paint and then go back over. When I take the roller off all the paint has been used up. Should I get a 1/2 nap?
 
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Old 02-06-16, 04:04 AM
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It sounds like the drying roller is picking the paint back up over the primed area [because it dries/absorbs slower than the unprimed] While a shorter nap may help, I believe another coat or two with the 3/4" nap should cover it. Have you tried just using a brush on those areas?
 
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Old 02-06-16, 04:10 AM
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Many factors

There are many factors in your case, some already mentioned. First, white is one of the easiest colors for stains & scuffs to show through being so light. Of course there are many shades of white but an off white would not be quite as light though still very much so when compared with dark stains. Of course the longer the dry time the better and better mixing helps which you say you did. So the biggest factor is back to white just being such a light color. More coats & longer dry time may likely be a given.
 
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Old 02-06-16, 04:13 AM
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I have not tried a brush on the primed areas. Won't it give me a different texture
 
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Old 02-06-16, 04:18 AM
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It shouldn't since the wall has already been rolled multiple times. If it does show a texture difference, rolling another coat once the brush work has dried should hide any differences.
 
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Old 02-06-16, 04:30 AM
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Some of the rooms that had patches have now disappeared while others have not. So if I paint over the primed areas with brush. Leave to dry and then apply another coat with a roller should be good enough. The wall is not 100% smooth I have checked some of the unpainted walls and they have a slight rough texture so I will still with 3/4
 
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Old 02-06-16, 04:52 AM
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Can I just use a mini roller rather than a paint brush?
 
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Old 02-06-16, 05:55 AM
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Yes, that would be an option.
 
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Old 02-07-16, 01:23 PM
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Thanks for your help. Recoating the primer patches with a mini roller did the job and the marks have disappeared
 
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