[Public-List] Butyl Tape

[Winslow Ayer]

Sounds great! So you don’t need any caulking around the flange? That would make it an ideal sealant and easy to apply.

Winslow

> On Jun 3, 2021, at 7:13 PM, John Maliszewski via Public-List <public-list at lists.alberg30.org> wrote:
> 
> It has been about nine years since I bedded all my GulfStar 37 porthole
> frames with butyl tape. The butyl tape I used still remains soft and
> pliable, although it has formed a slight outer skin at perhaps .005 inches
> level. My original logic for choosing butyl was that I
> anticipated replacing my inside teak paneling that was installed all the
> way to the ports and wanted to make sure that I could remove the port's
> frames easily when I got around to replacing the teak. My ports are
> mounted from the inside. Well nine years later I have absolutely dry ports
> and no new paneling. I can still see the butyl squeeze outs, from under the
> port frames and can confirm that they are pliable.
> During the original installation I was generous with the butyl and placed a
> full ribbon against the port frame before inserting the port into its
> opening. The key to good installation  is to make sure that you see butyl
> squeezing out as you tighten the mounting screws and then to go back in a
> couple of days later and continue with another 1/4 turn on your bolts, I
> repeated this process at least two times for three tightening sequences.
> The butyl tape I used is marine grade and has low flow characteristics
> under pressure. You can buy this tape from  https://marinehowto.com/  look
> under the featured products, and that is what I recommend; tapes purchased
> from other sources such as RV parts suppliers are not the same.
> 
> In general, the https://marinehowto.com/   is a worthwhile website for many
> DIY projects.
> 
> 
> John Maliszewski
> 
> jrmalis at verizon.net
> 
> 410.353.8115 (M)
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