# Seal crack caused by sunroof? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [October 19, 2019, 4:01pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076 "2019-10-19T16:01:25Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![Azmaveth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/azmaveth/32/18015_2.png) [@Azmaveth](https://community.cartalk.com/u/Azmaveth)\ **Post date:** [October 19, 2019, 4:01pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/1 "2019-10-19T16:01:25Z")
I have a 12 year old rebuilt Accord with a sunroof. At one corner, the metal roof is cracking and causing a hairline crack in the paint. It is beyond my budget and skills to get to the metal, weld it, repaint, etc. All I want to do is put some type of sealant over the crack to prevent water from penetrating. What would be the best product to use for something like this? ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [October 19, 2019, 5:10pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/2 "2019-10-19T17:10:51Z")
Waterproof silicone sealant. ---
**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\ **Post date:** [October 19, 2019, 5:12pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/3 "2019-10-19T17:12:18Z")
> [@Azmaveth](#): > > I have a 12 year old rebuilt Accord with a sunroof. At one corner, the metal roof is cracking and causing a hairline crack in the paint. is “rebuilt” a “salvage title” ? If yes, the crack may be due to some substantial damage repaired and now hidden under the layers of putty and paint, so it is likely that sunroof is only a weak spot, but is not a root cause of the issue I would use a wax regularly, to keep water and salt out… and hope for the best ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [October 19, 2019, 5:32pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/4 "2019-10-19T17:32:26Z")
Get a caulking tube of automotive seam sealer at your local parts store that sells body supplies. About $20 but that’s what it is made for. But the crack must mean the car is coming apart. Were these two cars welded together? ---
**Author:** ![Azmaveth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/azmaveth/32/18015_2.png) [@Azmaveth](https://community.cartalk.com/u/Azmaveth)\ **Post date:** [October 19, 2019, 7:00pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/5 "2019-10-19T19:00:09Z")
Yes, it’s a salvage title, and I know the metal underneath is cracked. It actually creaks when I drive. But it’s not worth it to me to tear it apart to fix the metal, I just want to keep water out. ---
**Author:** ![Azmaveth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/azmaveth/32/18015_2.png) [@Azmaveth](https://community.cartalk.com/u/Azmaveth)\ **Post date:** [October 19, 2019, 7:01pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/6 "2019-10-19T19:01:31Z")
Thanks, Bing. I’ll give the sealant you recommended a try. Yes, I know for sure the metal is cracked underneath. And I don’t mind reapplying sealant periodically. ---
**Author:** ![Azmaveth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/azmaveth/32/18015_2.png) [@Azmaveth](https://community.cartalk.com/u/Azmaveth)\ **Post date:** [October 19, 2019, 7:02pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/7 "2019-10-19T19:02:11Z")
Thanks, Purebred. I’ll give silicone a try! ---
**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\ **Post date:** [October 19, 2019, 7:09pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/8 "2019-10-19T19:09:10Z")
You know that car body integrity is compromised. I hope you will use your best judgement to stop driving this car when it becomes unsafe. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [October 19, 2019, 8:52pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/9 "2019-10-19T20:52:41Z")
That will work for a little while, but the crack will open up again. The only way to stop crack growth is the drill a small hole at the root of the crack to release the stress. If you drill the hole, the stress will be spread over the perimeter of the hole. If you don’t, the stress will be concentrated at the root (tip) of the crack, and the stress will be high enough to keep the crack growing over time. Fill the crack with silicone after drilling the hole. ---
**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\ **Post date:** [October 20, 2019, 5:57am UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/10 "2019-10-20T05:57:35Z")
Gorilla Tape. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [October 20, 2019, 1:48pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/11 "2019-10-20T13:48:53Z")
> [@oldtimer-11](#): > > Gorilla Tape. … as long as it is better than _Flex Seal Tape_! Unfortunately, I believed their TV advertising hype, and discovered that this stuff really doesn’t work. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [October 20, 2019, 6:36pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/12 "2019-10-20T18:36:31Z")
The only thing to remember with using silicone is that nothing will stick to it again, not even more silicone. So no paint and if it cracks again, you have to get all of the old silicone off and clean the surface completely before another application of silicone can be put on. That’s why I don’t like the stuff for a lot of applications. ---
**Author:** ![Renegade](https://avatars.discourse-cdn.com/v4/letter/r/b4bc9f/32.png) [@Renegade](https://community.cartalk.com/u/Renegade)\ **Post date:** [October 20, 2019, 6:41pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/13 "2019-10-20T18:41:05Z")
I don’t know what their TV ad’s say as I don’t have a TV but year;s ago when I first used gorilla glue & found out how good it was I checked out the tape & it worked on every thing I used it on & found it was as good as the glue. ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [October 20, 2019, 7:45pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/14 "2019-10-20T19:45:05Z")
Do yourself and family a favor…get rid of the car before it becomes a death trap.What do you think would happen to you and your passengers if the car rolls over due to an accident.The roof will collapse and you are history. No amount of caulking can fix this, believe me. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [October 20, 2019, 8:04pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/15 "2019-10-20T20:04:27Z")
Would he be safer in a vehicle with a fabric top? ---
**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\ **Post date:** [October 21, 2019, 11:54am UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/16 "2019-10-21T11:54:53Z")
If this “rebuilt” car has an expanding crack in the roof where any buyer should have been expected to notice it, imagine what’s going on underneath where you aren’t looking. I would at minimum get it into a body shop for a careful inspection. This could be very dangerous. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [October 21, 2019, 12:09pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/17 "2019-10-21T12:09:48Z")
> [@shadowfax](#): > > If this “rebuilt” car has an expanding crack in the roof where any buyer should have been expected to notice it, imagine what’s going on underneath where you aren’t looking. +1 The nature of modern unitized body construction means that the roof is actually a structural part of the car. A crack in the roof indicates that this vehicle is probably no longer structurally sound. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [October 21, 2019, 8:52pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/18 "2019-10-21T20:52:57Z")
> [@VDCdriver](#): > > A crack in the roof indicates that this vehicle is probably no longer structurally sound. Where’s the picture of that truck that broke in two when they put it on the lift. Yeah the roof is the sheet metal skin. Underneath that is the structural supports for the roof. So likely they cracked first. Of course if it’s FWD, you can even cut the back off and still drive it dragging the rear. Demolition Derby? ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [October 21, 2019, 9:00pm UTC](https://community.cartalk.com/t/seal-crack-caused-by-sunroof/151076/19 "2019-10-21T21:00:32Z")
> [@bing](#): > > if it’s FWD, you can even cut the back off and still drive it dragging the rear. Yup! You might recall that Chevy’s early ads for their new Citation model showed a Citation whose rear wheels had been removed and the back of the car was supported only by little “auxiliary” wheels. For the folks who had–somehow–managed to be unaware of the existence of Toronados, SAABS, DKWs, and other FWD models, this served as an education… of sorts.