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| Gmc roof [message #351882] |
Mon, 03 February 2020 17:44  |
Cal
Messages: 3
Registered: April 2018
Location: Ventura CA
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im looking for a roofing caulk to cover the front and back section of my eleganza 2, i tried this 3m 5200, but it crack on the back end and i was able to pull it out with my bare hands
anyone here know a good method to seal the roof to prevent leaks.
[Updated on: Mon, 03 February 2020 17:52] Report message to a moderator |
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| Re: [GMCnet] Gmc roof [message #351888 is a reply to message #351882] |
Mon, 03 February 2020 18:02  |
sgltrac
Messages: 2797
Registered: April 2011
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Park under cover.
Sully
Bellevue wa.
On Mon, Feb 3, 2020 at 3:45 PM Calvin via Gmclist
wrote:
> im looking for a roofing caulk to cover the front and back section of my
> eleganza 2, i tried this 3m 5200, but it crack on the back end and i was
> able
> to pull it out with my bare hands
>
> anyone hero know a good method to seal the roof to prevent leaks.
>
> _______________________________________________
> GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Gmc roof [message #351892 is a reply to message #351888] |
Mon, 03 February 2020 19:15 |
sgltrac
Messages: 2797
Registered: April 2011
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All kidding aside,
If the 5200 failed then you likely applied it to an improperly prepared
surface or outside of its ideal temperature or substrate parameters. There
are a few things that need to be paid attention to for any sealant whether
single component or dual component in order for them to work properly.
Not necessarily in order of importance as they all are equally.
Cleanliness of joint to be sealed.
Temperature of sealant product, joint to be sealed as well as ambient air.
Material makeup of joint (suitable substrate) for chosen sealant.
Environmental characteristics of where the joint will live ( uv exposure/
submerged in fluids etc)
Rate of movement or flex in joint, thermal, mechanical, vibratory etc.
All these as well as other conditions or product limitations should be
known prior to utilizing any adhesive or sealant product and if not listed
on the container or with accompanying paperwork, a phone call to the tech
service number with questions is in order.
That all said, are you planning on painting over the sealed joint? This
will narrow your selection.
I see that 5200 is approved for use below the water line which should
indicate that it is truly water proof. The brag specs also state that
appropriate substrates are wood, fiberglass, and gelcoat. Your roof is not
listed in the approved substrate list as it is painted and aluminum.
Another consideration is the types of applicators you have in your
possession. Most of not all two part adhesive sealants will require a
proprietary application system or “gun”. If you are not prepared for the
expense of purchasing the correct applicator this will again narrow your
product selection.
If you are now squeezing your temples with squinted eyes, it’s ok. Go to 3m
website and look up the spec for 08632. It is a single component,
paintable, moisture cured adhesive sealant which can be applied over damn
near anything stable. It is available in at least three colors as well as
cartridges to fit “soft” package dispensers or traditional caulk type guns.
I emptied close to a dozen soft tube cartridges for various internal and
external sealing and bonding duties on my 77. We use this same product for
adhering outer door panels or door skins to the door intrusion beam when
replacing the skins. I do not know of one failure.
Hope this helps.
Sully
Bellevue wa
On Mon, Feb 3, 2020 at 4:02 PM Todd Sullivan wrote:
> Park under cover.
>
> Sully
> Bellevue wa.
>
> On Mon, Feb 3, 2020 at 3:45 PM Calvin via Gmclist
> wrote:
>
>> im looking for a roofing caulk to cover the front and back section of my
>> eleganza 2, i tried this 3m 5200, but it crack on the back end and i was
>> able
>> to pull it out with my bare hands
>>
>> anyone hero know a good method to seal the roof to prevent leaks.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Gmc roof [message #351893 is a reply to message #351882] |
Mon, 03 February 2020 19:24 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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Cal,
3M 5200 is tremendously tenacious stuff. If it didn't work, the surface wasn't prepared correctly. If someone had "fixed" the roof with silicone caulk, well they thought they were doing the right thing but they shot you in the ass. Pretty much nothing sticks to cured silicone caulk and it's a royal pain to remove all traces of it so the new caulk will stick.
It's not clear from your post what you mean when you say you want to "cover the front and back section". Are you referring to the seams between the central sheet of aluminum (roof proper) and the front and rear molded caps? Or covering larger areas...? Please elaborate.
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
[Updated on: Mon, 03 February 2020 19:25] Report message to a moderator |
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| Re: Gmc roof [message #351970 is a reply to message #351893] |
Wed, 05 February 2020 15:44 |
jfkarls
Messages: 53
Registered: June 2019
Location: Racine, Wisconsin
Karma: 0
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This what i got back from the 3m Tech people, he claims below the 4000UV would be better because the 5200 isn't UV resistant. What do you guys think? = "Thank you for contacting 3M Automotive Aftermarkets.
3M (TM) 5200 Marine Adhesive Sealant will bond to aluminum and fiberglass. However, the 5200 is not UV resistant and would need to be painted. This product is a permanent product and you would have to also scuff the aluminum.
A better UV product would be 3M (TM) 4000UV, PN06580 which can also be used to fill the seam. Still will have to scuff the aluminum.
An automotive seam sealer would be 3M (TM) Urethane Seam Sealer, PN08367 that can be applied to bare metal or scuffed or primed metal. You can purchase at Napa or Carquest stores in your area.
Please let us know if you have any further questions."
Sincerely
Clauzel G.
U.S. Business Services Operations
3M Automotive Aftermarket Division
http://www.3m.com/automotive1-877-666-2277
Joe & Valerie Karls
1976 Eleganza II, & 1976 Palm Beach - Also own
1967 Lincoln Continental Convertible,
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| Re: Gmc roof [message #351973 is a reply to message #351970] |
Wed, 05 February 2020 17:48 |
Angel Rodriguez
Messages: 22
Registered: June 2018
Karma: 0
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Junior Member |
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I have used 3M 5200 sealant but then I did more research. I ended using Life Seal after it was recommend by a boating forum. So far two years and haven't seen any leaks come through.
"A unique combination of marine silicone and polyurethane, formulated especially for fiberglass. LifeSeal offers a fast-curing, low odor, high adhesion, non-sagging, non-corrosive, non-yellowing formula. It provides a durable permanent water tight seal for joints subject to structural movement. Use for sealing decks to hulls, thru hull fittings, vinyl ports, sealing/glazing windshields, and bedding marine hardware. Will adhere to metal, glass, wood, Lexan, ABS, and other materials. Not recommended for ferrous cement hulls, impregnated wood, or oil soaked materials. Cures in water. Mildew resistant and acid free."
https://www.amazon.com/gp/product/B00144D6MU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Angel Rodriguez
San Jose, CA
1978 23' Birchhaven
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| Re: [GMCnet] Gmc roof [message #351989 is a reply to message #351973] |
Thu, 06 February 2020 10:31 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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There are a fair number of really good flexible sealants out there. But,
the very best stuff in the world, applied improperly, is a waste of time.
You ABSOLUTELY, POSITIVELY, HAVE to have the surface properly cleaned, and
EVERY LAST TRACE of any product that contains silicone removed. Nothing,
and I mean Nothing, will adhere to a surface where there is the slightest
trace of silicone. 3M makes several good products that will do this. Other
companies as well. But, every last trace of old previously used products
MUST be removed. Do it in a protected area, under the recommended
temperature ranges that the sealant manufacturer recommends, and give
adequate curing times, and you will be happy with the results. No short
cuts here. It is drudgery to be sure. Uncomfortable up on that roof. Been
there, done that. Many times. Pull up your big boy panties, and just commit
the necessary time to the project. No short cuts.
Jim Hupy
Salem, Oregon
On Wed, Feb 5, 2020 at 3:49 PM Angel Rodriguez via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I have used 3M 5200 sealant but then I did more research. I ended using
> Life Seal after it was recommend by a boating forum. So far two years and
> haven't seen any leaks come through.
>
> "A unique combination of marine silicone and polyurethane, formulated
> especially for fiberglass. LifeSeal offers a fast-curing, low odor, high
> adhesion, non-sagging, non-corrosive, non-yellowing formula. It provides a
> durable permanent water tight seal for joints subject to structural
> movement. Use for sealing decks to hulls, thru hull fittings, vinyl ports,
> sealing/glazing windshields, and bedding marine hardware. Will adhere to
> metal, glass, wood, Lexan, ABS, and other materials. Not recommended for
> ferrous cement hulls, impregnated wood, or oil soaked materials. Cures in
> water. Mildew resistant and acid free."
>
>
> https://www.amazon.com/gp/product/B00144D6MU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
> --
> Angel Rodriguez
> San Jose, CA
> 1978 23' Birchhaven
>
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