Sealant for sunroof replacement

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Sealant for sunroof replacement

Postby amx » Sun Mar 14, 2021 12:16 am

I'm in the process of replacing the entire sunroof assembly in my all-trac. The sunroof pan is sealed from the factory with a thick bead of some kind of rubberized sealant, and I'm trying to find a replacement for it. I tried Sikaflex 221, which the internet highly recommended for this application, but it was way too soft and messy to lay up a thick enough bead to fully seal against the roof. The gap between the sunroof pan flange and the roof on the Celica is huge -- like 3/8" or more all the way around.

Has anyone here replaced their sunroof, and if so, how did you seal it? Butyl tape? Polyurethane? Bathroom caulk?
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Re: Sealant for sunroof replacement

Postby abeans » Sun Mar 14, 2021 12:24 am

My buddy recommended this 3M stuff 8115 panel bond

https://www.youtube.com/watch?v=EG0CUEFt7Ao

Its spendy but works good.
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Re: Sealant for sunroof replacement

Postby 93celicaconv » Sun Mar 14, 2021 2:42 pm

You might want to investigate one of these two 3M products:

- 3M 08008: https://www.3m.com/3M/en_US/company-us/ ... 126&rt=rud

- 3N 08578: https://www.3m.com/3M/en_US/company-us/ ... 020&rt=rud
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Re: Sealant for sunroof replacement

Postby amx » Sun Mar 14, 2021 7:35 pm

Thanks for the links, will check those out!
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Re: Sealant for sunroof replacement

Postby amx » Sun Jun 06, 2021 10:52 pm

Very belated update: After doing some more research I ended up going with Sikaflex 252 because it was reported to have better anti-sag properties. In reality I don't think it was significantly easier to work with, but I had some tip-cutting beta that helped us lay up a much better bead.

The key is to cut an inverted notch into the cartridge tip. The notch should point backwards toward the cartridge, which will allow it to lay down a triangular bead that compresses into a square when the part is installed. This shape is also easy to adjust to make the bead as deep as necessary. Ours was probably 3/4" tall on average, and we still ended up having to manually push the sikaflex into place to fill a couple gaps after the sunroof was bolted in. That sunroof pan gap is no joke.
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