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Old 05-12-2020, 09:58 PM   #1
1 Rivet Member
1968 28' Ambassador
Portland , OREGON
Join Date: Mar 2020
Posts: 5
Should I remove all the old Trim-Pro in my walls?

I own a lovely 1968 Airstream Ambassador!
I'm about to seal up the interior of my trailer with Trim-Pro 635. I was wondering if I need to clean off the old Trim-Pro before applying a new application? When the subfloor was removed, we pressure washed the walls a few times. Although we still see a lot of old Trim-pro left behind. I started soaking the walls with mineral spirits and scraping away. To discover that it was a challenge to remove this stuff. I have started to come up with a new plan.

I think that it might be a good idea to scrape the seams and rivet areas places that will be important to apply the new Trim-pro. Or does it even matter? Also, if it is necessary to remove the old stuff, then does anyone have some advice on things that have worked? Even with the mineral spirits, my scraping is aggressive. Below I have included a few images to reference. Along with an example of a section that is already scraped away.
Thanks so much!
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Old 05-16-2020, 06:40 PM   #2
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VetteGuy's Avatar
1966 17' Caravel
Greenville , South Carolina
Join Date: Jun 2018
Posts: 51
I would put an application on top if it will stick with no issues. Like having double insulation. But if the new product has a chemical reaction to the existing you may not give it a good adhesion. Try a small spot in an inconspicuous area and see what happens and wait a couple days to see if it applied correctly without any peeling or flaking

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Old 05-16-2020, 08:24 PM   #3
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1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
Posts: 1,561
68's are the best!!

I think I would just put the new sealant over the old on the inside. It should stick with no problem. If you do want to remove some, a heat gun helps soften the old caulk.
A tip on sealing the outside seams: cleans the old joints of mold and crud. I'm mainly taking about the main seams on the end caps. Lay a strip of painters tape along either side of the seam with a small gap. Run your bead of Tempro and then with you finger run it along the seam in one direction and press it into the gap, then run you finger the other way. That ensures the gaps are filled and smooths the bead. Then immediately and carefully remove the tape. The edges will self level and you will have a very neat thin bead of sealant with straight edges. If you wait a while before removing the tape it will leave a little ridge the thickness of the tape and it will collect crud.
Bruce & Rachel
68 Trade Wind
2001 Toyota Tundra
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Old 05-16-2020, 08:29 PM   #4
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1973 21' Globetrotter
Houston , Texas
Join Date: Sep 2009
Posts: 2,675
Don't overthink it. If you do, your rebuild will take forever. It is very easy to say, "as long as I'm here, I may as well...."

I squirted a load of Trempro into a can, and then thinned it with mineral spirits. I then painted it onto whatever was already there (after having pressure washed the interior as you already have done). My thoughts are that thinned down, it ought to soak into whatever cracks or voids are there, and if it just sits on the surface of already rock-hard sealant, then so be it. The good news is, that with the entire interior removed, when you are done, you can soak the exterior with water and look for leaks. You might be surprised to see what you observe even with a liberal application of sealant inside.

good luck!
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