Willsee indents belowFred
> On Jan 23, 2016, at 2:12 PM, William Daniell
<wdaniell.longport@gmail.com> wrote:
>
> Is it ok to fill on top of gel coat orovided that its scuffed up. In
other words is it necessary to go down to the fiberglass?
>
I can tell you what I=99ve doneI think it=99s
=9Cok=9Dthen again, I do not have any experience
w/ the surfaces having been out in the sun for long periods of time,
airborne or otherwise.
Using a 3 foot long rigid sanding board, I sanded off gelcoat
down to the FG in the high spots, following the manual re: orientation
of strokes, grit, etc...thenusing a flexible, cushioned sanding
=9Cboard=9D, I removed most of the gelcoat and thoroughly
scuffed the lower portions of the surface. I did this to both top and
bottom of wing.
On the top surface of the wing, I applied the blue Poly Fiber
=9CSuperFil=9D; as I recall, a 3 gallon kit was sufficient
for top and bottom of tail planes, ailerons, flaps, and rudder. After
curing and sanding, I rolled on multiple coats of Poly Fiber =9CUV
Smooth Prime=9D to both top and underside surfaces. After sanding,
for final filling, I used 3m =9CFlowable Finishing Putty=9D.
My only regret at this point is that I wish that I had allowed
much more time for curing of the SuperFil before sandingalthough
I knew that the filler continues to shrink after it=99s initial
cure, for some unknown reason, I blocked out this information and I
began sanding it only a couple of weeks after it had been applied. I
fear that over time, I will be able to detect dips between the ribs,
though there are no signs after two years of any showing up.
The most pleasurable part of the process was the sanding of the
UV Smooth Prime, a very high-build primer, the sanding of which left me
with a high level of satisfaction.
Good luck...
> I am dealing with the wing skin join and the fuselage join
>
> Thanks
>
> Will
>
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