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Old 04-12-2019, 05:27 PM   #221
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Old 04-24-2019, 02:50 PM   #222
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Sealing w/ Sikaflex 221

I have read through this thread and it has been very informative, thanks all!

It seems that the preferred product is Sikaflex however I also read not to use it on anything that might be removed. Doesn't it eventually break down and have to be replaced?

Thanks
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Old 04-24-2019, 03:16 PM   #223
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I have read through this thread and it has been very informative, thanks all!

It seems that the preferred product is Sikaflex however I also read not to use it on anything that might be removed. Doesn't it eventually break down and have to be replaced?

Thanks
Eventually. My AS is stored outdoors and Sika lasts 4 - 5 years on surfaces that receive a lot of sunlight. Parbond lasts longer, maybe 6 years.
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Old 05-13-2019, 12:07 PM   #224
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Originally Posted by lewster View Post
Here is another alternative for sealing caulking tubes. I used to use the 'caulking condoms' but found these to be much better!!


Hey Lew, what is this and where do you buy it?


Bob
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Old 06-09-2019, 10:23 PM   #225
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Sikaflex aging out

I had solar panels installed on the roof of my trailer in 2014. The mounting feet were attached with VHB, and then they were covered in sealant.

Now it's five years later. The sealant is shriveled and cracking. The installer says this sealant is Sikaflex 221. I had hoped it would last longer. (the sealant the factory used when the trailer was built in 2013 is still in decent shape.)

The trailer has been stored under cover since new, except when we have been using it (600 to 700 days).

The good news is, I can apply some new 221 over this, without removing the old.
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Old 06-14-2019, 06:56 AM   #226
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Quote:
Originally Posted by SSquared View Post
I had solar panels installed on the roof of my trailer in 2014. The mounting feet were attached with VHB, and then they were covered in sealant.

Now it's five years later. The sealant is shriveled and cracking. The installer says this sealant is Sikaflex 221. I had hoped it would last longer. (the sealant the factory used when the trailer was built in 2013 is still in decent shape.)

The trailer has been stored under cover since new, except when we have been using it (600 to 700 days).

The good news is, I can apply some new 221 over this, without removing the old.
I'm not certain if I know what I'm looking at in your picture but it appears the original Sikaflex was not "tooled" to give it a uniform thickness and appearance. It looks like the Grand Tetons with lots of ups & downs and nooks & crannies. You may want to consider removing all or part of it in order to get a good bond with the new Sikaflex.

Sikaflex can be tooled with a terrycloth rag moistened with mineral spirits. Mineral spirits can be used on a plastic trowel too in order to make a more uniform application of the sealant.
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Old 06-14-2019, 07:27 AM   #227
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Quote:
Originally Posted by SSquared View Post
I had solar panels installed on the roof of my trailer in 2014. The mounting feet were attached with VHB, and then they were covered in sealant.

Now it's five years later. The sealant is shriveled and cracking. The installer says this sealant is Sikaflex 221. I had hoped it would last longer. (the sealant the factory used when the trailer was built in 2013 is still in decent shape.)

The trailer has been stored under cover since new, except when we have been using it (600 to 700 days).

The good news is, I can apply some new 221 over this, without removing the old.
Exactly why I cleaned it all off and used 3M Sealing tape, do it once...correctly..... "tooled" or not caulkstuff times out rapidly.
8th Season SFSG.

Bob
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Old 06-24-2019, 10:00 AM   #228
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3 M Tape ?

Quote:
Originally Posted by ROBERT CROSS View Post
Exactly why I cleaned it all off and used 3M Sealing tape, do it once...correctly..... "tooled" or not caulkstuff times out rapidly.
8th Season SFSG.

Bob
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Tells us more about this tape, seems I have not read about this till now. How long have you been using and what are your results. Do you apply to all roof seams or just to roof openings ie vents?
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Old 06-24-2019, 10:39 AM   #229
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I just finished researching and applying this on my square roof openings and am waiting for a narrower roll to do the seams. Robert can tell you his experience, but the 3M site has some good data sheets. Looks like a very well-engineered roof sealant that lives up to the 3M reputation.
I cleaned with isopropanol and applied 3M adhesion primer. Then I rolled it firmly down with a small paint roller.
I have not decided what to do about round penetrations as I am not sure I want the flappy flywheel look.
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Old 06-24-2019, 11:44 AM   #230
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I just finished researching and applying this on my square roof openings and am waiting for a narrower roll to do the seams. Robert can tell you his experience, but the 3M site has some good data sheets. Looks like a very well-engineered roof sealant that lives up to the 3M reputation.
I cleaned with isopropanol and applied 3M adhesion primer. Then I rolled it firmly down with a small paint roller.
I have not decided what to do about round penetrations as I am not sure I want the flappy flywheel look.
Larry
Larry, Really...only the Birds and the Angels will see it.😂

LAWBC.....here is a link the the site.

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Old 06-24-2019, 12:22 PM   #231
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Larry, Really...only the Birds and the Angels will see it.😂

LAWBC.....here is a link the the site.

Bob
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Yes, but I may not sleep well under it knowing it is there. I can't pretrim a round piece because the stuff is so sticky you must apply it right after cutting it off the roll.
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Old 06-24-2019, 08:53 PM   #232
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Would there be any concerns with this tape causing filiform corrosion like the THOR decals were causing a few years back?

Just wondering, it sure looks like great stuff. John
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Old 06-25-2019, 10:34 AM   #233
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Would there be any concerns with this tape causing filiform corrosion like the THOR decals were causing a few years back?

Just wondering, it sure looks like great stuff. John
Filiform is caused by a compromise in the Alcoa clearcoat, as long as the panel is intact the 3m will not promote it.

Bob
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Old 06-25-2019, 07:04 PM   #234
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Filiform is caused by a compromise in the Alcoa clearcoat, as long as the panel is intact the 3m will not promote it.

Bob
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Thanks Bob. I thought I had seen instances where the Thor sticker itself had caused the filiform.

John
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Old 07-01-2019, 06:21 PM   #235
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Hey SSquared, mine did the same thing, same year as yours and it looks the same. So you can just put more Silaflex over the old stuff? I would like to do that until such time I have time to really take it all off and then reapply. Thanks
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Old 07-05-2019, 02:26 PM   #236
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Silkaflex 221 white ... is that what the factory has been using along the seams between awning and roofline? Any hints on use other then a good cleaner to ensure a bond.
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Old 07-05-2019, 07:33 PM   #237
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Hey SSquared, mine did the same thing, same year as yours and it looks the same. So you can just put more Silaflex over the old stuff? I would like to do that until such time I have time to really take it all off and then reapply. Thanks
I found that only about half of my solar feet seemed to need attention. Where the sealant was applied in a somewhat thick mound, it still seemed good. Where it was just a thin layer, it was cracked and shrunken.

I used a razor blade (in a holder) to cut/scrape the old sealant off the top of the metal feet. I was surprised at how easy that was. I left the sealant that was on the roof alone. Then I put new sealant over the feet and the old sealant.

Ask me in five years how it worked out.
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Old 07-10-2019, 12:50 AM   #238
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Silkaflex 221 white ... is that what the factory has been using along the seams between awning and roofline? Any hints on use other then a good cleaner to ensure a bond.
can't comment on jc, and it has been awhile since The tintin master has been updated, but i (based on lewstsr's recommendations) used 715 when the dealer installed 2 new fans. I understand it's use is designed for horizontal edges and flashings and is more pliable and workable at application. The 221 as i understand it it is more applicable as an adhesive and for more vertical seams.

It is an older post but here ya vo.

http://www.airforums.com/forums/f456...-116214-7.html
For a good recap from a pro search this thread for lewster read his comments.

B
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Old 08-01-2019, 01:21 PM   #239
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Has anyone used Dymonic 100 from Tremco? The local Tremco distributor said that it's like vulkem but it has more flex. According to the tube it has 100% stretch and 50% compression before failure. If I'm reading it correctly. Attachment 240731
Just had this product recommended from the AS dealer. He indicated this is what AS is using as well now. I liked the product. I used it for the awning rails and the top of the windows. It is very easy to work with. I unfortunately only bought 1 tube of it so I had to drive an hour to a major city to get more.

They also sold it in the "sausage" style in the 20 oz (600 ml) size. I just didn't want to deal with another caulk gun, but in retrospect if I have to do an entire trailer I would go with the "sausage" style gun. They have some great tips for the sausage guns and some have odd angles so you can get into tight places easier. That would make it much easier to re-caulk under the awnings, although I removed the small awnings and with the larger awning I just unbolted the arms and then lifted the awning up with some standoffs. Just be careful that the spring loaded arm doesn't swing up.
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Old 08-05-2019, 05:01 PM   #240
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I have noticed that white Silkaflex 221 has yellowed considerably in the 6 months since I put it on. This particular applications was along the seams of an SOB trailer but the results are the same no matter the application. There is a pretty good contrast between the yellow Silkaflex and the white trailer. I have not seen this kind of yellowing with Silicone or even latex caulk. I have found that the paintable silicone does not hold up well painted or unpainted.



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