One way to help decide is to take two identical sized pieces of scrap plywood.  
Fill one with whatever filler and the other with the deck cloth and epoxy.  
Then weigh.  I covered my fuselage ply and wing/tail skins with deck cloth.  I 
used a heat gun or hair dryer to help soak up the resin.  A few areas I needed 
to add resin to the deck cloth, so basically the wieght of the cloth is the 
only penalty (on the wing). Also as stated, the pin holes are far and few 
between.  When covering the plywood with deck cloth, you will find the resin 
goes a long way.
My plug is to go for it.
Roger Baalman rbaalman at cox.net

> ________________________________________________________________________________
> 
> Corrected math:
> 
> 12.5 sq ft in each yard of cloth
> 24 sq ft on each outer wing surface
> 2 yards of deck cloth is 2.8 oz
> plus 3 oz of resin (1.5 oz  / yard)
>   that is 17.2 oz per wing panel surface.  Still a cheap fill and it 
> adds some strength.
> 
> Larry Flesner 
> 
> 
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