OK the project seems to going well (ES-5V) and yes I have been trying to resist moving onto the next coat until the last one has had enough Tassie drying time.... however was more than somewhat surprised about how much sanding was required with my (PB approved) super fine steel wool..after the second coat I decided to vacuum the steel wool waste that was collecting inside the guitar. A reasonable job...but when I get to the final coats and before the electrics are installed, how important is it to suck out any remaining steel wool residue?