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Old 02-04-2013, 09:05 PM   #1
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Freightliner Owners Club
Join Date: Aug 2011
Location: Petaluma CA
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How many tubes of Sikaflex to reseal windshield?

Getting ready to re-caulk the front windshield to stop the leaks and wind noise & figured I'd get some clarification on the correct procedure.

From reading all the posts here, looks like I need to do the following:
  • clean everything thoroughly
  • remove all the previous caulking
  • clean the surfaces again with acetone
  • apply painters tape to keep the Sikaflex from getting on the body
  • Apply Sikaflex 200 using a caulk gun
  • Let it cure for a day or two
  • Remove tape and enjoy!
Here's my questions
  • How many tubes of Sikaflex should I purchase?
  • Is this product so thick that I should consider using an air powered cualk gun?
Thanks in advance! Looking forward to a great 2013 RV season!


Adam B.
1996 Airstream Cutter '32 Freightliner X-Line Chassis, Cummins B5.9 Turbo, Allison 6-Speed MD3060
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Old 02-05-2013, 07:26 AM   #2
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Alas the answer depends on how thick you apply it but Murphy has the real answer.

You will need N+1,, Where N is the number you buy.

Wish I could be of more help but on a motor home windshield I would not even consider a DIY attempt. I want someone who has the proper power gear (porta power) to handle that hunk of glass.

Home is where I park it!
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Old 02-05-2013, 08:16 AM   #3
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When I had mine done at the factory (Discovery one piece) they used approximately 6 tubes, and the had a special heater to heat up the tubes to make the Sika flow easier. The also used an air powered gun to apply the caulk. Keep in mind that was for a replacement of the windshield not a reseal. Additionally they used Pro-Seal cleaner to prep the surface. Acetone may start to remove the paint if you are not careful. This may be one of those jobs best left to a professional.
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Old 02-05-2013, 09:29 AM   #4
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Location: USA
Posts: 182
I take it you are going to attempt to reseal it by chaulking it on the outside? If so you are only going to mask the real problem which will be rust. The windshield will crack sooner or later due to the rust pushing on the glass. If anything I would isolate the point of the leak and add some sealant to that point only. If you seal the entire windshield by filling the groove around it a future windshield replacement will be very difficult if not impossible. No glass shop will touch it.
Roy & Sabine Lyons
98 Itasca 35' Class A Gas with Banks Powerpack
98 Honda CRV Toad
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Old 03-25-2013, 07:08 PM   #5
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Location: Sacramento, CA
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Adam did you ever do this repair Sikaflex?
Some of the most asinine things people do are typically preceded by the two words "Watch this".
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Old 03-26-2013, 03:05 AM   #6
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Hahahaha... you now owe me a new keyboard since I spit coffee all over it while reading your response!
Originally Posted by wa8yxm View Post
Alas the answer depends on how thick you apply it but Murphy has the real answer.

You will need N+1,, Where N is the number you buy.

94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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