I'm using SuperFil and Aeropoxy Light, as well as micro, and have observed a significant difference between the two commercial products.

 

SuperFil tends to flow-out as it cures, while Aeropoxy Light doesn't. If the surface I'm filling is level, I use SuperFil. It will flow together as it cures, filling the pinholes that were created when I applied it. On the other hand, SuperFil on a vertical surface will sag significantly, leaving a low spot where you wanted filler and a high spot downhill from it.

 

I use Aeropoxy Light on vertical surfaces because it stays put and will not sag. But it's lack of flow-out also leaves pinholes and voids unfilled. Of course, if your spreading technique is better than mine, you might not have pinholes and voids to fill.

 

SuperFil also remains workable longer than Aeropoxy Light, although both are slow enough that I've never had a problem when mixing small batches.

 

Dennis Johnson