[Public-List] Butyl and Polycarbonate

[Rod via Public-List]

Glen :
It seems to me that I should know Dolphinite from way back but I don't recall seeing it recently.  Where do you buy it and in what form ? ( tape, squeeze tube,  tube for caulking gun, tub ? )


Cheers,  Rod 

<div>-------- Original message --------</div><div>From: Glenn via Public-List <public-list at lists.alberg30.org> </div><div>Date:07-10-2014  12:37 PM  (GMT-05:00) </div><div>To: Bill Wallace <wayfarer3134 at yahoo.com>, Alberg 30 Public List -- open to all <public-list at lists.alberg30.org> </div><div>Subject: Re: [Public-List] Butyl and Polycarbonate </div><div>
</div>Hello Bill,

People on the Cruisers Forum seem to like butyl for all kinds of bedding applications also.  As an alternative, I  use Dolphinite to bed my poly window replacements with out any discoloration or fogging for 
6 or 7 years now.  Seems to work very well, and cleans up super easy with thinner.  Also doesn't grow mildew around the edges like some of the synthetics , as it contains a herbicide of some sort.

Glenn brooks
Dolce 318

Sent from my iPhone

> On Oct 7, 2014, at 6:45 AM, Bill Wallace via Public-List <public-list at lists.alberg30.org> wrote:
> 
> If you read those lists, things like butyl acetate are problems, but the chemical in butyl tape, isobutyl isn't listed as a problem.  That isn't definitive, as I couldn't find a positive statement about isobutyl being safe.  If you are using polycarbonate, expect to redo the portlights every 5-7 years.  That is what I was replacing and mine were nearly opaque after about 8 years.   I will watch mine and see if there are any problems, but so far after 1 summer they look good with the butyl tape - it isn't clear how long it would take to react if there is going to be a problem.  For sure, cleaning up butyl is far easier than cleaning silicone, so if I have to replace them in a few years, it will be a much small job than the first replacement was.
> 
> Bill.
> 
> 
> On Monday, October 6, 2014 4:29 PM, Greg Bover via Public-List <public-list at lists.alberg30.org> wrote:
> 
> 
> 
> When I redid my port lights a few years ago it wasn't because they leaked,
> it was because I couldn't see out of them anymore because of fogging. When I
> got the boat they were an unknown plastic and caulked with what appeared to
> be butyl. I use polycarbonate in my business and I knew that it was subject
> to embrittlement and fogging when exposed to certain chemicals. I did some
> research and found lists like the ones at
> www.palramhort.com/pdffiles/PC...Info/PC_Chemical_Resistance.pdf  and
> http://www.holophane.com/hlp_library/brochures/HL-2445.pdf.
> As there are various sorts of butyl and butyl compounds on the lists of
> chemicals to avoid in contact with polycarbonate I opted to use a Dow UV
> resistant silicone. I had to do quite a bit of masking to make a neat job of
> it, but so far, (two years) it has held up well with no sign of fogging.
> It seemed to me that the best combination would have been safety glass with
> butyl, but the estimate for just the glass for the four larger ports was
> $250, whereas I could use off cuts from my shop for nothing. Ahh.life on a
> shoestring.
> 
> Greg Bover
> A-30 #114
> PENSIVE
> Gloucester
> 
> Gregory R Bover
> V.P. Operations, Project Manager
> C. B. Fisk, Inc.
> www.cbfisk.com
> 978 283 1909
> 
> 
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