Prepping porch paint

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Old 06-03-20, 12:59 PM
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Prepping porch paint

I have a previously painted (unsure how many times) concrete porch (about 10' x 6') that I am looking to paint.

Unless I get a better recommendation, I'm planning to use Behr elastomeric paint. Behr recommends "removing all loose paint", and I'm wondering how you would go about doing this. It really isn't cracking that badly, just here and there. What is the best route -- Strip it? Sand it? Take it off with a pressure washer? Please advise on proper preparation as I know it is the most important step. Thanks.
 
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Old 06-03-20, 01:06 PM
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Unless I get a better recommendation, I'm planning to use Behr elastomeric paint
Please, do a little searching on this site for all the horror stories about Behr paint, it is pure krap!

It really isn't cracking that badly, just here and there.
You need to get all that paint off, you have no idea what is there, it's condition, type of prior paint used, if you dont you are setting yourself up for possible failure. Surface grinding would do the job!
 
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Old 06-03-20, 01:32 PM
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As far as I know elastomeric paints aren't formulated for foot traffic. You'd want to use a porch and deck enamel.
I'd start out cleaning it with a pressure washer and go from there.
 
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Old 06-03-20, 01:36 PM
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Thanks. Angle grinder with what type of wheel? Or something else?

I've had good results with Behr and they have a lifetime guarantee, but what would you recommend?
 
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Old 06-03-20, 01:42 PM
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They rent a concrete sander [scarifier?] which I think Marq might be referring to. IMO that's over kill for what you need. I'd pressure wash and see how much comes up, if you don't like how it looks after PWing you could brush/roll on a chemical paint stripper, let it work and then either scrape or pressure wash again.
 
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Old 06-03-20, 01:43 PM
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You're right. I used elastomeric on the foundation and got it confused.
 
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Old 06-03-20, 01:46 PM
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I pressure washed this approximately a year ago and never got around to painting then. I think it's worth a shot, though, so I'll post an update once I do that.

Thanks.
 
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Old 06-04-20, 09:41 AM
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The pressure washer got off what you see in the picture when I get the tip right down on the concrete. I think it would take forever to try and do the whole porch, so I think I'll rent an angle grinder from HD. What type of disk would I need? Is there a risk of really damaging the concrete surface?
 
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Old 06-04-20, 10:41 AM
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I'd apply a chemical stripper, let it work and then scrape or pressure wash it off. Sometimes it takes multiple applications. If you sand I'd expect 60 or 80 grit would be what you' want to use.
 
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Old 06-04-20, 10:49 AM
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Is there a risk of really damaging the concrete surface?
If you use anything like a grinding disc or a cup grinder yes, the area is to small and it can dig into the surface and although it's not going to structurally damage the pad it will be visable through the paint.

Some type of large surface grinder!

FYI strippers are nasty, and if you dont get it all off it will react with the new paint but some people love them!
 
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Old 06-04-20, 12:32 PM
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Well darn I don’t really want to go the big drum sander route.

I’ll give the stripper a go and see. What is the best to use, scraper (just a metal paint scraper?) or is sanding it better? I was thinking maybe some really coarse steel wool.
 
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Old 06-04-20, 12:43 PM
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The trick with strippers is to apply it and let it work but scrape off the paint before the stripper starts to dry. The stripper 'wrinkles' the paint as it lifts it from the substrate. A wide stiff putty knife works good for scraping. The more caustic strippers work a lot better than the green/citrus strippers.
 
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Old 06-04-20, 04:38 PM
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Okay thanks. Klean-Strip Premium got really good reviews so I’ll give it a go. And I don’t want anything “green”, lol, just that paint gone!
 
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