Akzo Nobel Pinhole Filler

I cheerfully admit to being very, very cautious about fillers, surfacers, and anything else under an expensive paint job.

I was on the Wicks site this AM ordering some stuff and noticed a listing for "Fiberglass Pinhole Filler", Akzo Nobel 28C1, (#28C1-G, $105.31).

http://www.wicksaircraft.com/catalog/product_detail.php/pid=10626~subid=8467/index.html

The material data sheet describes an application method like Lohle Wonder-Fil ($179 gal); rub/wipe into the surface, let dry, rub off.

http://www.anac.com/products/DataSheets/28c1.pdf

Searching turned up specific references to 28C1 ("apply this") in literature from major composite industry players like Henkel. Also seems to be on the qualified products list for all the major airframe manufacturers.

Anybody have experience working with this product, or information regarding long term durability?

Addendum, 4-5-09: just checked the Wicks catalog again. The price has doubled in less than two months!

One interesting note...

...is that it is stated to be only compatible with epoxy and polyurethane top coats/primers.

It sounds like you may need to be careful with the type of primer applied over it, and the type of any further fillers applied.