The Expancell has the big advantage of being cheap - after ordering the
tailplane kit the factory introduced the XS so I had a massive amount of
Expancell sufficient to complete foam core wings. It is not particularly
difficult to use and sand but Polyfiber's SuperFil is definitely easier to
use. SuperFil spreads nicely but with the homemade mix it is difficult to
get the consistency just right - it is too easy to get it either runny or so
thick that it refuses to stick to the surface being filled. Both sand at
about the same rate so it is possible to fill with SuperFil over the
Expancell mixed with the Aeropoxy (not to be confused with Aeropoxy Light
Filler which I have not used) and blend the two to a good finish with no
discernible line between the two materials.
SuperFil is also compatible with Polyfiber's Pre-Prime so the Pre-Primed
surface can be filled with SuperFil directly over the Pre-Prime to fill
those very small indentations that were not visible until the surface had a
gloss (there's your answer to getting it right the first time around - I
didn't, but did not know it until after rolling on the Pre-Prime). Here
too, the stuff blends perfectly after sanding, this time with the Pre-Prime.
I used both fillers "dry," meaning without coating the surface to be filled
with epoxy.
Best regards,
Rob Housman
Europa XS Tri-Gear A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Ronald J.
Parigoris
Subject: Europa-List: Light weight fill
<rparigor@suffolk.lib.ny.us>
Wondering if anyone has fooled with aeropoxy light weight fill?
Superfill?
How friendly are these products at adding to low spots and getting the same
sand
ability?
Do you need yo apply a light coat of resin before applying either aeropoxy
light
or superfill?
Any other products better?
Or just stick with expancel and make sure you fill in enough first time
around?
Thx.
Ron Parigoris
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