The tank sealant used on most "wet wing" metal planes is

called Pro

Seal and

it adhears to fiberglass as well.  This stuff is resistant

to auto

fuel with

alcohol and works great but is not "sloshable".   All of the

sloshing

compounds (both aircraft and automotive) I've tried have

failed the

auto

fuel test.  The small amount that I ran down the seams in my

tanks

(thank

heavens I didn't actually slosh it) peeled off after about a

year

and lodged

in the gascolator screen.  BTW, this is one reason I like a

coarse

filter

that can be inspected in the fuel system before the final

fuel

filter.  You

can see trouble coming before it becomes an in-flight

emergency.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

Thanks to Tracy & all the others who responded. Now that I
know Proseal sticks to fiberglass, I'm going to try that
(with suction) first.

I'll post results when available.

Charlie England

BTW, Proseal is just a trade name for the generic Polysulfide which

was

mentioned in other posts.  You will recognize it in use because when

the two

parts are mixed it smells like a cross between cat crap and rotten

eggs.

The low viscosity brush on variety should be ideal for fixing

fiberglass

leaks.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

FYI,
  ProSeal comes in various viscosities & cure times. The thin "brush on"
type referred to by Tracy is type A. Next is type C. This is recommended
for sealing ribs to skins, etc. Last is type B (which Van's supplies

with

their kits) Type B is recommended for fillets and sealing large gaps.

The

cure times range from 1/2 hour to 24 hours. Sooo.... the can will read
something like
A-2
meaning it is the thinnest viscosity and has a working life of 2 hours.

I

should mention that the working life is extremely dependent on ambient
temperature. These products have a limited shelf life (9-12 months at

room

temps). You can easily double the shelf life if you store them in a
refrigerator when not in use.
  You can also "thin" your ProSeal by mixing it with MEK. (Man I wish

Van's

would supply C instead of B!!)  Surface cleanliness isn't the only thing
with ProSeal, it's EVERYTHING!

Charlie Kuss
RV-8A fuselage
Boca Raton, Fl.

PS  Don't ask me why the viscosity doesn't run A to C,   thin to thick.

I

have no clue. I guess they just did it that way so that it would be

counter

intuitive!!

Charlie,

Do you know what company sells Proseal A?

Jerzy

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