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    I actually use both micro and Super-Fil, depending on the situation.
The Super-Fil is nice to work with, not only because you're not floating
glass microspheres all over the shop, but it has a much slower cure than
micro, so you can mix a large batch without exotherm, and work with it for
quite a while.  Like a thick micro mix, as you drag a spreader across it,
the surface tends to roughen and leave small pockets, but you can use a heat
gun and a heated metal trowel to smooth the surfaces pretty nicely.
Peel-ply over the top is also a good trick for some areas, and can save some
sanding time.  I don't use the Super-Fil for making fillets on layups, but
do prefer it for body filling.  It's also handy for filling seam areas in
skins before priming -- you just blade a very thin layer over the seam area,
or any "weavey" area, pressing hard to force the Super-Fil into the voids in
the weave.  Easy to sand later, and can save a couple of extra coats of
primer.  The convenience of having each batch come out to just the right
consistency is nice, too.

    In any case, either is vastly superior to polyester-based fillers,
which, no matter what the manufacturers say, will shrink and crack over
time.

Jim Cameron, ES #2 in progress.


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Please send your photos and drawings to marvkaye@olsusa.com.
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