Metal roof caulk question. off topic

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Old 11-19-16, 01:42 PM
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Metal roof caulk question. off topic

Hello. I have a off topic question.

I have a ford van that had rust in the top gutter where the roof meets the sides. I have removed the rust and primed and painted with POR-15 and now would like to fill the entire gutter with a caulk that has UV protection instead of hard automotive seam sealer so that the gutter no longer collects water. I will need to later remove it because it will rust again, as this is a temporary fix short of cutting out and welding in new metal.

Now I'm looking for the best, longest lasting removable caulk to fill the drip rail gutter and have come up with names like solarseal, 3M4200, NP1 , Vulkem 116 , Sika Flex, Dymonic to name a few and need to make a decision.

Can anyone help me make a decision?

Thanks!
 
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Old 11-19-16, 03:41 PM
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Sika Flex is a very good sealant and has excellent expansion properties and weather proofness ( I know it ain't a word), can be applied as low as 40 degrees F.
 
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Old 11-20-16, 08:07 AM
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Thanks chandler.

I wish I could find a review that compared the products I'm considering. But I imagine any of them would probably work as intended.

Generally, is polyurethane caulk considered the longest lasting if you don't consider silicone?
 
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Old 11-20-16, 11:05 AM
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I'm stuck on the word "removable", which is notbreally a characteristic of any of the different types of caulking you mention. I don't know what you expect, so maybe you could clarify that. None of them will peel off cleanly, all will require great effort to remove all traces of residue.

Of the ones you mentioned Vulkem and Dymonic FC will be the "softest" most pliable, easy to cut.
 
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Old 11-20-16, 11:38 AM
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Thanks XSleeper.

Since rust in the E350 gutter area cannot be completely removed because the roof is crimped to the sides, it will rust again and I will need to remove it and do it all over one day. Later rather than sooner hopefully.

That's one reason I don't want to use silicone or something permanent like 3M5200.

I found one guy who used Vulkem 116 in his E350 gutter. But Iv read Vulkem changed the formula and people switching to NP1.
 
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Old 11-20-16, 11:43 AM
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How often do you expect to have to redo this? I'd clean off as much rust as possible, use a rust conversion coating if it can't all be removed and apply a couple of coats of primer. The few times that I've recaulked an automotive gutter I just used a cheap butyl caulk.
 
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Old 11-20-16, 12:02 PM
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How often is hard to answer marksr. But with the rebuilt cummins I just installed, at least a few times.

I like the properties of butyl caulk, but cost isn't a consideration for this project. I don't mind spending more for a 3M product for example, if I get longer life results.
 
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Old 11-20-16, 03:38 PM
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I am curious as to how installing a new engine will affect the gutters above the doors?
 
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Old 11-20-16, 04:12 PM
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LOL... i think he means now thst a good engine is in the van, he will want to keep the body from deteriorating for as long as possible. Unfortunately I think Ford intends for their body parts to rust out, as its good for sales.
 
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