Butyl tape, or caulk under the trim?

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Butyl tape, or caulk under the trim?

Postby AllenS » Wed Jun 13, 2018 5:25 pm

In another week or so, I'll be ready to start skinning my teardrop. I'm wondering if the butyl tape under the trim is an absolute must, or if I could run a good, thick bead of caulk under there first and get the same type of protection. I ask simply because it seems like the caulk would be a lot easier to work with.
-Allen
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Re: Butyl tape, or caulk under the trim?

Postby dsotto » Wed Jun 13, 2018 6:39 pm

We used butyl tape and didn't really notice it. Just laid it down and put the trim on and attached it and then popped in the vinyl.
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Re: Butyl tape, or caulk under the trim?

Postby greygoos » Wed Jun 13, 2018 7:59 pm

I have always used butyl tape. Put it in the refrigerator the day before you install.
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Re: Butyl tape, or caulk under the trim?

Postby GuitarPhotog » Wed Jun 13, 2018 8:40 pm

I used butyl tape to seal the roof patch on my standy. Then I used TremPro 635 polyurethane caulk around the outside to absolutely seal it. In actuality the tape is easier to work with because it doesn't smear and the like. Don't try to assemble the skin and trim then caulk. You need to apply caulk or tape before screwing down the trim.

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Re: Butyl tape, or caulk under the trim?

Postby les45 » Thu Jun 14, 2018 4:10 am

I used butyl tape under all my trim.
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Re: Butyl tape, or caulk under the trim?

Postby swoody126 » Thu Jun 14, 2018 7:41 am

when applying trim and fittings on boats we DRY FIT 1st remove and COUNTERSINK the holes where screws/bolts go into a base material(usually wood or wood cored fg) that could succumb to moisture/rot

the countersinks let the caulk/tape get into the holes and do a better job of protecting the wood

just another way to do things

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Re: Butyl tape, or caulk under the trim?

Postby tony.latham » Thu Jun 14, 2018 9:43 am

I use butyl tape under the fan and the front side of the hurricane hinge. I do it under the fan because someday it'll need to be replaced. I use it under the hinge because it's much easier to set the hatch on and get it set with the tape.

I use a polyurethane sealant under the trim. I helped a friend replace the butyl tape under the trim on his motorhome. He had leaks. If he hadn't already purchased the stuff, I would have suggested a poly sealant.

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Re: Butyl tape, or caulk under the trim?

Postby aggie79 » Thu Jun 14, 2018 4:53 pm

3M 4200 under all trim, hatch hinge, and hardware, and in screw holes. Butyl tape under vent fan and windows. After install, cut off butyl tape squeeze out and run a bead of OSI Quad poly sealant.
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Re: Butyl tape, or caulk under the trim?

Postby AllenS » Fri Jun 15, 2018 11:57 am

Thanks for all the responses, there's a lot of helpful suggestions here. I think I'll be going with the butyl tape.
-Allen
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Re: Butyl tape, or caulk under the trim?

Postby NorthEGPhoto » Wed Jul 04, 2018 7:21 am

greygoos wrote:I have always used butyl tape. Put it in the refrigerator the day before you install.



Just my inexperience talking, but how does putting it in the refrigerator help? does it make it so you can re-stick it if you screw up the first time?
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