Slight Ridges In Primed Panel - Painting - DIY Chatroom Home Improvement Forum

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Old 02-11-2014, 06:03 PM   #1
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Slight Ridges In Primed Panel

I prepared a large piece of Durock essentially identical to the walls as mentioned in a previous post for the purpose of trying different paint colors. I got a quart of a S-W Multi-Purpose primer on the advice of the store clerk. Actually, he didn't know what mastic (which the Durock was skimmed with) was, and thought this would be the best surface prep. As this panel is only 18"X56", I used one of the disposable foam brushes to paint the primer with.

I see the primer laid down nicely uniform, but I see there are hundreds of very slight ridges in the finish. As this is my first time to paint, I'm not sure if it's my inexperience or the foam brush. Maybe the primer is too thick for the foam brush, and should've been applied with a roller? I don't think I applied a lot of pressure.

What I'd like to know is:

1) Is this normal, and the paint will hide those slight but noticeable ridges?

2) Should I use a different primer? Or thin-down the primer?

3) Should I use a roller or bristle brush?

4) Should the primer be sanded? I tried a light sanding with slight pressure, and the primer seems pretty hard in finish-which I would think it's supposed to do. I didn't try any more/harder.

5) Should I prime a second coat? I did this one in a L-R orientation; maybe it should've been random?

Again, any help is greatly appreciated. Thanks in advance.


Last edited by Chuck H.; 02-11-2014 at 06:04 PM. Reason: added question
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Old 02-11-2014, 06:10 PM   #2
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Foam brush was your first mistake. You may be able to sand the ridges down with an aggressive hand sanding or you could try a palm sander if you feel comfortable using one. Once you get those ridges sanded down, you may have to apply more primer to the bare spots you will be creating. This time use a 9" roller cover with a 1/2" nap.


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Old 02-11-2014, 08:34 PM   #3
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OK; will do. Actually, I don't care about the finish on that panel since it's just to test for color. Good to know it's (possibly) the brush and not me.

Thanks again, Gymschu!
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