The Murphy Builders Site

That is indeed impressive, Wayne. Since my floats were put together with
proseal (Philippines), would this stuff help with skin removal? Not that I
need any, yet, but you never know what might happen.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne
G. O'Shea
Sent: Wednesday, November 23, 2011 4:48 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Polygone - Proseal Polysulfide eater!
Product
Review

I now have an idea on what to do with all my ruined clothes from over the
years...... gonna try this stuff on one of my shop coats and see if it
only
eats the proseal and not the material !!

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: "Murphy Rebel Builders List" <rebel-builders@dcsol.com>
Cc: "Gary Wolf" <garywolf@rogers.com>
Sent: Wednesday, November 23, 2011 7:38 PM
Subject: [rebel-builders] Polygone - Proseal Polysulfide eater! Product
Review

Was into a real mess on this wing tank fabrication that I'm currently on.
The previous builder had built wet tanks.. skipped a LOT of attention
to detail and gave up on trying to fix leaks years later. They cut all
the rib and stringer structure apart and installed fiberglass tanks,
leaving the wings with no compression or tension strength in the first
3 bays, which unfortunately had the new aircraft owner in a terrible
place. In between that work they had tried the sloshing compound
fiasco and it was everywhere as well. It was bonded REAL nice to all
the flat surface though, but of course it will never seal gapping
holes or skin overlaps that were never prosealed in the first place.

So once I had the wings all torn apart... the tanks out, wing ribs
removed..
top and bottom tank skins gone and wing skins cut back.... rear fuel
tank bulkheads tossed in the big round can, I still had a pair of main
spars and their skin overlaps coated in all this crap. So while
browsing ACS to order some new Proseal 890B-2 I noticed a product
called Polygone..........

"PolyGoneT stripping agents are unique formulations that remove
polysulfide
(PRC) and silicone RTV sealants from metal, ceramic, and some plastic
substrates. The top polysulfide producers include PRC DeSoto (now
PPG), AC Tech, and Flamemaster. The top silicone producers are GE, Dow,

and Wacker.

Both polysulfide (polysulphide) and silicone RTV are difficult to
remove completely since they actually bond into surface/substrate. The
typically, sealant removal method requires scraping that results in
damaging the substrate. There are also products that try to "disslove"
the sealants but due to their inertness, this does not work. PolyGone
however, reacts with the polymers chemically and breaks them down so
they can be rinsed away without damage to the surface/substrate. This
offers significant advantages over other removal methods. PolyGone
emulsifiers are specialty blended chemistries that wet and penetrate
the polymer and relatively quickly emulsify it. This emulsification
prevents redeposition of the reaction by-products and allow for water
rinsing"

Figured what the hell, I'll give it a try and if it saves hours and
hours of labour trying to mechanically remove the mess.... or risking
my eyes to a gallon of MEK then the $210 per 5 lb pail of the stuff
would be a great investment. Well today and yesterday I gave it a
whirl. I brushed on the gel (that stays absolutely in place even
upside down) and then poked it around with the brush every 30 minutes
as per the directions. This stuff doesn't just lift the sealer it
actually emulsifies it and pulls it up out of the aluminum pores.
After about 4 hours I used a plastic scraper to remove the majority of
the sealant and slosh. Stubborn spots I recoated and left overnight.
Today I scraped most of that off easily and a few spots needed another
splash of remover and about an hour later I had everything looking
like shinny new aluminum ready for a good scotchbrite crosshatch and
new parts to rivet / seal in.

The nice thing is that this stuff has no odor or fumes and it can be
rinse with water if you like (or you can use acetone). It also eats
and removes epoxy primer, as you can see in the pictures where the
third bay was painted and not part of the original 2 bay wet wing.

Never again will I fight like mad, trying to mechanically remove the
proseal from a badly prepped area of skin / rib or bulkhead to fix a
tank. Even at a cost of $210, for a 5 pound pail, I figure I saved the
customer at least double that in labour by using it. Now that I've
seen how far it went, I probably could have got away with about 3 x
6oz packs @ $21.50each.
instead
of the 5 lb pail. Oh well... if someone has a spot they need to clean
send me an email and I'll put some in a heavy ziplock container or
similar for you. It has a one year shelf life, if kept cool and in the

dark.

Before..

http://www.irishfield.on.ca/gallery/polygone1.jpg

The stuff...

http://www.irishfield.on.ca/gallery/polygone.jpg

Stuff starting to eat..

http://www.irishfield.on.ca/gallery/polygone2.jpg

http://www.irishfield.on.ca/gallery/polygone3.jpg

http://www.irishfield.on.ca/gallery/polygone4.jpg

After first scrape...

http://www.irishfield.on.ca/gallery/polygone5.jpg

Second coating..

http://www.irishfield.on.ca/gallery/polygone6.jpg

A little plastic persuasion..

http://www.irishfield.on.ca/gallery/polygone7.jpg

After wiped with Acetone..

http://www.irishfield.on.ca/gallery/polygone8.jpg

Regards,
Wayne

PS... and yes Gary you can use it if you need something for the RF
magazine!





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