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Old 08-17-2009, 12:47 PM   #1
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paint went tacky

Guess you could take that a couple ways...

I noticed that the paint on my interior walls has morphed and is now very sticky. I primed it with XIM and painted with S/W Duration in December. Both the primer - and then the laytex - completely dried between coats and appeared to be fine until a couple months ago. I noticed it was becoming kind of sticky. I thought it might be the humidity and tried to ignore it. However, yesterday, after I'd already had a fit over applying Vulkem outside, I just couldn't was dumbfounded by how tacky the interior has become. The ABS bulkheads are fine but everywhere else is super sticky. I called S/W for some help and they said a sales rep would phone me.... sometime... Till then, anyone have some advice or suggestions? I can't imagine what has happened - like some chemical process has taken place. Outgassing of original vinyl wall covering? The XIM primer was suppose to prevent that...

Laura
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Old 08-17-2009, 01:35 PM   #2
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Laura,

Don't know about the problems with your paint, but we've had several older Airstreams we bought used, and every one of them had the same stickyness you discribe on the vinyl type coating on the aluminum walls. Don't know where it comes from, or what causes it, but it's definately there.

A good cleaning with something like 409 takes it off the original vinyl wall coating.
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Old 08-17-2009, 02:03 PM   #3
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I can't imagine what has happened - like some chemical process has taken place. Outgassing of original vinyl wall covering? The XIM primer was suppose to prevent that...
Sounds like off-gassing of the vinyl to me. Sorry to say, the XIM may not have done what it was supposed to do.

The only thing I have heard to work on the sticky vinyl is to clean it real good then cover with a coat of Future Floor Wax...I don't know what to do with it coming through the paint. My guess would be to re-prime with a different primer...then paint again. I've seen good results with Zolatone over the vinyl...

Bummer!

Shari
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Old 08-17-2009, 02:07 PM   #4
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Boy - you've had a rough week - hang in there. See if this does anything for you or gets you started towards a cure...

Latex paint sometimes does not dry properly and stays tacky... also called blocking... from the Natural Handyman home repair and do it yourself website
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Old 08-17-2009, 02:24 PM   #5
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Laura, I have the exact same problem (same primer, same paint, same Airstream). I guess it's time to call S/W and see what they have to say. I'll start making some phone calls.

Jim
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Old 08-17-2009, 03:28 PM   #6
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Well, I have an answer, believe it or not.

Spoke to the answer guy at Sherwin Williams (local rep) and he recommends trying the following.

S/W sells a product made by MinWax called "Polycrylic" (I'm sure that's not spelled right). It is formulated as a top coat for latex paints. He suggested that we scuff up the surface with something like a Scotch-Brite pad and roll on a layer of this stuff. Wait a few weeks and see if the "tackyness" comes back.

I'm going to give this a shot on the walls under the beds (I'm in the process of putting the bedroom back together right now) and see how it goes. I'll post back here the results, if that's OK, Laura.

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Old 08-17-2009, 03:40 PM   #7
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Well, I have an answer, believe it or not.

Spoke to the answer guy at Sherwin Williams (local rep) and he recommends trying the following.

S/W sells a product made by MinWax called "Polycrylic" (I'm sure that's not spelled right). It is formulated as a top coat for latex paints. He suggested that we scuff up the surface with something like a Scotch-Brite pad and roll on a layer of this stuff. Wait a few weeks and see if the "tackyness" comes back.

I'm going to give this a shot on the walls under the beds (I'm in the process of putting the bedroom back together right now) and see how it goes. I'll post back here the results, if that's OK, Laura.

Jim

Great to hear you got a quick response. I'm still waiting. The S/W guy was going to phone the sales rep immediately. I'll give him till tomorrow noon - then I'll call back. Though I'm sorry to hear you're having the same problem - but it's reassuring that it's not *just me*.

Boy - hope the top-coat product works for you! I can't imagine scuffing the surface without it getting all gummy and unlevel. But the thought of stripping it down to the vinyl is too overwhelming. Please - post your results!!! And if I get a return call that gives some alternate advice, I'll pass it on as well.

Laura

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Old 08-17-2009, 03:51 PM   #8
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Will Do. I'm going to try and get it done this week. Anything is better than that "Future floor wax" solution. I just can't help thinking that floor wax will fail over time.

BTW, I used Sikaflex on the outside of the camper, Vulkem on the inside. Seems to work better that way (yes, I saw your other thread).

Jim
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Old 08-19-2009, 09:20 PM   #9
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Well, this stuff looks promising. I scuffed the paint with Scotch-Brite a bit, then brushed on a coat of the polycrylic. The tacky/sticky is pretty much gone. HOWEVER, I did all of this tonight after the sun went down. Let's give it a few days in the summer heat and humidity, try a couple of different areas before we call it good.

Major concerns include:

1) It takes as many as 3 coats according to the label on the can.
2) How does heat (and cold) effect the coating?
3) Will it peal and check over time?
4) It's kind of a pain to work with (Not a bad thing if it actually works)
5) Expensive, about $17/quart, $45/gallon

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Old 08-20-2009, 08:32 AM   #10
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Well, this stuff looks promising. I scuffed the paint with Scotch-Brite a bit, then brushed on a coat of the polycrylic. The tacky/sticky is pretty much gone. HOWEVER, I did all of this tonight after the sun went down. Let's give it a few days in the summer heat and humidity, try a couple of different areas before we call it good.

Major concerns include:

1) It takes as many as 3 coats according to the label on the can.
2) How does heat (and cold) effect the coating?
3) Will it peal and check over time?
4) It's kind of a pain to work with (Not a bad thing if it actually works)
5) Expensive, about $17/quart, $45/gallon
Jim
My fingers are crossed that it works for you (and holds up over time). What was particularly difficult about working with it?
Laura
Thanks for the update!
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Old 08-20-2009, 05:24 PM   #11
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Just a lotta steps to "do it correctly".

I'm going to mask off an area tonight up high on the wall, on the theory that there's more heat up there, then put a couple of coats on there, let it sit a couple of days in the summer heat and humidity and see how it turns out. I checked the area painted last night when I got home from work and all of the tackiness is gone. Looks like this may actually work.

Have you heard back from S/W yet? I'm interested to hear what your guy has to say.

I'll keep posting the results here as it goes along.

Jim
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Old 08-24-2009, 09:21 PM   #12
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Well, we have some good news. This stuff is definitely taking the sticky out. Or, rather, covers it over. I decided to leave one test area with two coats and the other with only one coat. Two coats seem to cover better than one. The sticky isn't coming back thru the topcoat of the Polycrylic and it seems to be holding up pretty well to the heat and humidity.

I'm going to let it sit for a while longer before I put anymore up on the walls. If for no other reason than I want make sure it's not going to crack and peal in the heat.

Let me know if you need more info. I'll post back here if any problems pop up.

Jim
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Old 08-24-2009, 10:18 PM   #13
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I am a retired plastics engineer and have formulated many flexible PVC compounds. This sticky problem is common to many non-rigid PVC compounds. It is caused by the liquid plastiziers, that are used to make the PVC flexible, becoming incompatible with the rest of the PVC compound and being kicked out of solution or what we call "spewing". The degraded liquid plasticizers bleed to the surface of the PVC and then migrate into or combine with the top coat you have put on to cover up the problem. To be successful in the long run, you need to pick a top coat that is completely impermeable to the plasticizers. Otherwise, you will just cover up the problem till the plasticizers destroys the topcoat polymer. The underlying problem is the stabilizers in the plasticizers break down over time and the plasticizers degrade. You can not do much about that.
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Old 08-25-2009, 10:26 AM   #14
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Dwight, can you recommend something? Name brand, I mean.

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