Poly-Fiber quotes
>Superfil at 3.7lbs/gal.
>Shaun Simpkins
>A207
Thats incredibly heavy.
For comparison, water is 10lbs/gallon (imp) or Blue foam 0.32lbs/gal (more
than ten times lighter than Superfil!).
Expancel can be mixed at 1.16lbs/gal but is fun to apply at this density
(the recipe for which is 17ml epoxy + 15ml fume silica + 17ml Q-cel + 120ml
Expancel. All volumes are bulked/loose. High-shear mixing needed (strong
wrists) until putty-like and the placed filler "sealed down" with a hot
spatula before it sets).
Primer-fillers are typically 20 to 25 lbs/gal (dry film density).
The moral is that the foam cores need to be perfect to avoid having to fill
any more than necessary and the use of primer-filler should be minimised.
Duncan McFadyean
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