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Old 04-14-2015, 07:27 PM   #99
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Has anyone had any experience removing these sealants? What are the best methods for removing each of them?
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Old 04-14-2015, 07:55 PM   #100
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Has anyone had any experience removing these sealants? What are the best methods for removing each of them?
DON'T apply SikaFlex 221 to anything that you may eventually want to remove, without a replacement going in it's place. It is extremely tenacious and there is no known solvent.. mechanical removal is the only process that works.......and it ain't easy!!!!!
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Old 04-14-2015, 08:07 PM   #101
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Most professional caulking companies I have dealt with use kerosene to cut/trowel poly-based sealants while wet. I use alcohol to cut/trowel silicone sealants while wet. Most of these sealants are solvent-immune once cured.
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Old 04-14-2015, 08:10 PM   #102
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Most professional caulking companies I have dealt with use kerosene to cut/trowel poly-based sealants while wet. I use alcohol to cut/trowel silicone sealants while wet. Most of these sealants are solvent-immune once cured.
Just a quick note......NEVER use alcohol as a cleaning/prep agent if you are intending to use SikaFlex polyurethane, as it inhibits it's adhesive properties (per Sika Corp.)
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Old 04-14-2015, 08:19 PM   #103
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Just a quick note......NEVER use alcohol as a cleaning/prep agent if you are intending to use SikaFlex polyurethane, as it inhibits it's adhesive properties (per Sika Corp.)
Only alcohol w/ silicone...kerosene w/ poly. Not as prep agents but to trowel/cut (i.e. clean up beads). Silicone has limited uses on AS trailers to begin with. I would only use silicone for glass (windows) and a few interior applications.
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Old 04-15-2015, 08:41 AM   #104
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I just use a rubber-gloved finger for smoothing. No solvents ever.


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Old 04-16-2015, 01:25 AM   #105
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I love Sikaflex
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Old 04-16-2015, 09:53 AM   #106
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I'm curious. Why would using alcohol to clean the seam before caulking be bad? Seems it would evaporate completely and not affect the later application of the caulk.
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Old 04-16-2015, 12:38 PM   #107
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Alcohol must have some residual that remains on the substrate which then interferes with the bonding process of the polyurethane.

If the tech department of the manufacturer of SikaFlex says not to use it.........I DON'T!!

I use cases of the stuff and have never had issues while following the company's application guidelines.

If you are still unsatisfied with this answer, I would suggest a call to the chemists at Sika Corp. for their reasoning.


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Old 04-16-2015, 12:57 PM   #108
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I used Alcohol in a bunch of places before I saw the warning hear, as I might of stated earlier in this thread. For the most part, all my Silkaflex is still solid. And had no issues to my knowledge bonding. We'll see how it holds up, as only time will tell.
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Old 04-16-2015, 01:07 PM   #109
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It's possible that someone used rubbing alcohol instead of straight isopropyl alcohol. Rubbing alcohol has some oil in it and will leave residue for sure.

Best to not use alcohol at all to avoid any chance of an issue. I likely to assume Sikaflex manufacturer knows what they are talking about, and I DO know Lew does...


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Old 04-16-2015, 08:36 PM   #110
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I could see the issue with rubbing/isopropyl... what about methanol?
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Old 04-16-2015, 09:54 PM   #111
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Listen............

Some of you can of course, do as you like with your trailers. I use Sika products by the case in professional applications on a daily basis and NOT as a hobbyist or occasional user, so when the manufacturer says NO ALCOHOL...........I assume they have done the research to arrive at their conclusions and they mean NO ALCOHOL......... whether methanol, isopropyl or rubbing. There are no exceptions listed!!!!! Is this concept that difficult to grasp and understand?????????

If your application of said product fails.....it's what you did and you take the time to rectify your error. If mine fails on YOUR trailer.........it not only reflects on me, but also costs me to remove and replace the product.

I DON'T SECOND GUESS THE PRODUCT DIRECTIVES

And BTW, I'm done with my contributions to this thread!
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Old 04-17-2015, 08:10 AM   #112
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lewster thank you for your post. I am new to airstream and read these posts to learn more about maintaining my 2015 Sport. I for one would not disagree having your credentials you should know. When I see your post I always read it carefully. Thank you for contributing.


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