When I’m filling voids with sawdust and CA, I use the accelerator. Pack the void, dribble in thin CA, zap with accelerator, then sand smooth. Lather rinse repeat. 

I don’t use accelerator with medium or thick CA because that will bubble it out of the void, and mean more work. 

Yes, the accelerator will cause the CA to bubble, but with sawdust and thin CA, it’s mostly set immediately and the accelerator just sets any drips that ran across the surface so I don’t put my hand in it. 

May you have the day you deserve!