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Old 08-04-2024, 01:13 PM   #1
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Shower door warping in the AZ heat

We have 2019 Transit 350 that was built out by SMB West in 2020 just before they became Field Vans. The build has an indoor toilet and shower. Last year when the temperatures in Phoenix were > 110 degrees Fahrenheit for more than 30 straight days (inside temp in the van can reach 120-130 degrees!), I noticed that the PVC sheet membrane on the inside of the shower door was warping. I called Peter Del Toro at Field Vans about having the sheet membrane replaced on the door. He suggested that I heat the plastic with a heat gun and clamp it down to see if that would fix the problem. I did that this fall and although the door was not perfect, the sheet fit into the molding again and was smooth. I did not use any additional adhesive at the time. I was hoping that the original adhesive (i.e. Sikaflex) would heat up and bond again. When the temperatures elevated this spring the warping returned. My options, as I see them are: 1. Reheat the PVC sheet, use a spray adhesive in the warped areas and clamp down the sheet, 2. Remove the entire sheet, apply new Sikaflex, heat and replace the old sheet, 3. Remove the door and let Field Vans replace/repair the door.
The attached pictures demonstrate the lifting of the plastic sheet from the door. Pic #2 shows the results of “round 1.”
Currently the door has reverted to pre-repair warped condition.
If I decide on:
Option #1. What type of spray aerosol adhesive should I use?
Option #2. Is this a viable option?
Option #3. Have Field Vans restore /rebuild the door?
Other options?
Attached Thumbnails
IMG_0373.jpg   IMG_0375.jpg   IMG_0060.jpg  

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Old 08-04-2024, 01:45 PM   #2
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Other options..

Remove the sheet plastic completely, clean it up, but use a different adhesive. Epoxy?

Discard that door and build a new one out of a material that will hold up better. Melamine and marine-grade plywood? Glass?
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Old 08-04-2024, 04:20 PM   #3
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Once warped - repaired - twice warped - repaired ? Not sure it's a SMB problem - its an environmental problem. Move to - duh - where to escape the heat ? The whole US is experiencing temps that will only keep going up. Maybe make a frame that plexiglass can slide into - but allow 1/16 inch all around for it to breath or expand - wedge it in with something to keep it from rattling your brains to death - Good luck !
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Old 08-04-2024, 07:09 PM   #4
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My guess is that they used contact cement that is not rated for automotive temps.

Use DAP (Weldwood) Landau top adhesive; it's rated for higher temps.

I used that for 100% of my interior (about 3-4 gallons) and have nothing coming unglued after 10 years of So Cal summers.

The DAP landau adhesive is meant to be sprayed....however I've used a brush 100% of the time...I've only seen it sold in gallons, about $50 these days.

If you want a rattlecan type adhesive you could try headliner adhesive....it also bonds very well to the DAP landau top adhesive, although I think the landau top adhesive on both surfaces is likely a better bond.

If you are careful you can likely remove the door skin with a heat gun......tread lightly.


..and consider using a veneer roller to get it flattened down when re-applying.
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Old 08-06-2024, 11:00 AM   #5
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Thanks for the comments.
@doublevan2 I don’t have an issue with SMB West. The door was fine for 3 years. With the heat wave we experienced last summer, I agree that the main issue is environmental. I don’t have the skills or the tools available to build or rebuild a door.
@N147JK I am going to try and remove the entire skin from the door and @boywonder’s suggestion, use high heat resistant (HHR) DAP (Weldwood) spray adhesive. It looks like it is available in a 14 OZ. spray on Amazon. Fingers crossed
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Old 08-06-2024, 11:08 AM   #6
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Just offering up my opinion - without actual experience. Much like N147JK - as he has lots of experience in "things" also. Boywonder is top notch with years of experience - I'd go with anything he suggests !
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Old 08-06-2024, 11:34 AM   #7
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I totally agree with that assessment.
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Old 08-06-2024, 12:05 PM   #8
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Quote:
Originally Posted by Charliesmom View Post
I am going to try and remove the entire skin from the door and @boywonder’s suggestion, use high heat resistant (HHR) DAP (Weldwood) spray adhesive. It looks like it is available in a 14 OZ. spray on Amazon. Fingers crossed
Interesting, I've never seen the spray.....yes that's the right stuff....consider buying 2 cans...you may need them. You want to get a nice even coat on both surfaces.

The beauty of contact cement is the open time...don't stick the mating parts together until each glue surface has tacked up. ....test with your finger...if it's still gooey liquid you aren't ready.

Once the glue has tacked up you can apply within say a 30 minutes window or so..read the can.

The challenge is going to be getting the skin exactly lined up the the door.

The usual method is to have an oversized skin .....a few inches around all the sides (more if you are a beginner) then stick the parts togetehr then trim with a laminate trimmer.

If you've veneered or applied laminate before then you already know all this....

Around here the gallon is about $55 but you have to pretend that you are a professional to avoid a prison sentence. ...and the brush method would work just fine here but spray is easier.

There are several ways of getting the skin down without bubbles:

I usually (with a helper) start with the panel mostly vertical with the door on saw horses and align one end with the door then carefully roll (the motion is actually more like "unrolling") the skin on to the door, essentially squeezing all of the air out of the way as you unroll. The problem with this is that by the time you get to the opposite end of the door the odds of the skin being perfectly aligned are slim.

You can also place scrap sticks/dowels across the door spaced every foot or so.....then lay the skin on the dowels........the adhesive won't stick much to the dowels be it WILL STICK to itself rather well......then starting in the middle remove a dowel and press the skin to the door and continue working outboard to either end with the "unroll" technique to avoid air bubbles.

If you've stuck a little bit together you can pull apart and reposition......but once you get going there is no repositioning. ..Well you can heat gun the skin back off carefully and start over.

Once you've removed the skin for reapplying try acetone and a putty knife to clean off the old glue from both surfaces. If acetone won't do it heat gun and putty knife likely will...carefully.....without burning the skin.


Here is a tutorial thread I did years ago........


https://www.sportsmobileforum.com/fo...ial-14419.html


Here is a youtube demonstrating the dowel/stick method:


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Old 08-07-2024, 01:31 PM   #9
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@boywonder Thanks so much for the tutorial, advice and explanation. My door is a laminate and not MDF ...TG. I am going to try to get it back in place without removing the molding. We’ll see how that goes.
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Old 08-07-2024, 01:42 PM   #10
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Originally Posted by Charliesmom View Post
My door is a laminate and not MDF ...TG. I am going to try to get it back in place without removing the molding. We’ll see how that goes.

Not sure I'm following.......the skin is a laminate? Like Formica? What the door core made out of?
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