Not sure of that method but have used the thin carbon strip method on built up wings...

If you glue a thin piece of carbon strip between two pieces of balsa or trailing edge material, you can sand the balsa down until it exposes the carbon strip at the trailing edge, doing this both sides will give you a trailing edge which is as thin as the carbon used and durable too. Other options are to use poly ply (BVM product) or thin FR4 / epoxy glass board which is the same as poly ply to achieve the same results. Only issue with carbon is it can stain the balsa when sanded, but if its being covered or painted it makes no difference.

marcs