Baking Soda- whadja think it stood for??

One of my favorite methods for a light, super-strong gap-filler is baking soda. Anybody else here use this method? Say you have a gap between 2 pieces of wood that you want to fill (yeah, yeah- it wouldn't be there if I had done it right in the first place). [>:]

What I do is pour a small amount of baking soda onto the area to be filled, and use an old credit card to scrape off the excess- leaving the gap full of baking soda and even with the surrounding material. Then the soda gets a drop or two of thin CA- just enough to get all of it wet. Too much CA will bubble up excessively. Watch out for the fumes!

This process sets instantly, and creates a very strong, easily sandable filler that has just a bit of flexibility to it (its stiff/strong, but not brittle). Here's an example of a cross-member that I didn't shape perfectly, but was able to get a good result anyway with the B.S. method.

Anyone else here use this trick?