Oily film on newly painted porch floor

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Old 10-16-17, 08:04 AM
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Cool Oily film on newly painted porch floor

Hi all, I found this site after trying to google the problem I'm having and I'm hoping someone can clue me in as to what's happening with my porch paint project and how to fix it.

My house is about 120 years old and I'm finally getting around to tackling the front porch paint job. Over the course of about 4 days I scraped all chipping and peeling parts, scrubbed it all down with a bleach water solution to get rid of some mildewy spots, then covered the whole thing in a bonding primer and let that dry for approximately 24 hours before applying the first coat of paint (Valspar latex porch and patio paint).

By the time I got the first coat on it was getting late in the day, so I gave it overnight and all the next day to dry before going for the second coat. However, I just went to check on it, and one side of the porch (it's an L shape) seems to have an oily film over it. It's not so bad on the side that gets more direct sunlight, but the one side pretty oily. I do live in Florida so it's always humid, and it did sprinkle rain for about 10 minutes yesterday (the side that's oily got the brunt of this, so I'm guessing that has something to do with it)..

So my question is - what causes this? And more importantly, how can I fix it? I still have to put the second coat on, but I'm not sure if I need to prep somehow or try to remove it before applying the second coat. Any help is greatly appreciated!
 
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Old 10-16-17, 08:24 AM
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Welcome to the forums!

Did you rinse the bleach solution off? What color is the P&D enamel? How cool did it get at night?
 
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Old 10-16-17, 08:33 AM
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Hey marksr! I did rinse the bleach solution off (scrubbed with a bleach/water mix, then hosed off to rinse) and gave it plenty of time to dry out before priming. The enamel is a dark color (dark charcoal gray, almost black), and it's been in the mid 60's at night pretty consistently for the last couple of weeks. It was decently foggy this morning which isn't typical, and it's *always* humid since it's Florida, which throws an extra kink in any outside painting. I'm just not sure what I need to do now in order to get the second coat on correctly. Thank you!!
 
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Old 10-16-17, 08:41 AM
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The colorant that makes the latex paint dark takes longer to dry and the night dew didn't help it any. Is the oily film anything that you can wipe off? I'd probably give it a light sanding and then apply the 2nd coat - earlier in the day so it will mostly be dry before nightfall.

I used to live in fla but don't have any fond memories of working in the intense humidity
 
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Old 10-16-17, 08:47 AM
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That makes total sense. I suspected something like this but good to know, thank you! It's oily but not sticky so it can definitely be cleaned off. I'll do that and give it a light sanding then get the second coat on early. Even if it leeches a little through the second coat I can clean that off too, just as long as the second coat actually adheres to the first. Thank you for your help!
 
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Old 10-16-17, 05:36 PM
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If the porch is that old I would have presumed it was oil based paint and gone with that.
 
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Old 10-18-17, 02:07 PM
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Hey marksr, just wanted to stop in and say thank you for the advice! I was able to get the second coat on in time for it to dry out before night time and it even rained a bit that night and still came out looking great without any more issues. Thank you!
 
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Old 10-18-17, 03:04 PM
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thanks for the update, glad it worked out for you!
 
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