I would seal it to get a final moisture barrier outside the microballoons.
I faired the bottom of Rutu before turning her over and figured I better
seal it up well not only for a moisture barrier but some protection during
the rest of construction. I rolled and tipped three coats of epoxy with
about 60% by weight copper. I could see my face in it.

I will be doing the same to the topsides (without the copper). Then sand to
about 240 before applying the high build primer and 2 part LPU. I tested
that substrate/primer/topcoat combination on my Gerr Nester and that poor
little boat has been sitting upside down by the pond in full sun for 3 years
now and looks as good as the day the paint cured.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

wrote in message
oups.com...
Thanks for the heads up

Missing information:
Stitch and glue plywood construction, epoxy and fiberglass overlays the
wood ( no wood is exposed ), one part polyurethane finish, the area in
question is the entire hull.

"Glenn Ashmore" writes:

I would seal it to get a final moisture barrier outside the microballoons.

When building my boat I painted (2-part LP) directly on the
fairing compound and as far I can see it works just fine.
My boat enters its 20th season right now.

http://hem.bredband.net/b262106/

--
Martin Schöön "Problems worthy of attack
show their worth by hitting back."
Piet Hein

I would go to a good high build primer and then paint after that.

wrote:

I would go to a good high build primer and then paint after that.


Which is NOT epoxy resin.

Resin, by itself, is quite brittle, Will chip loose, Will crack,
and will NOT serve as a seal coat (for very long).

Sand the fairing material smooth.

Prime (per above) and paint.

THe only way to seal the fairing compound of a male one off is to "tight
glaze" the compound with Rojo after the hull is fair, then shoot high
build primer followed by LP.

Lots of sanding in between.

Anything less and you are kidding yourself.

Lew