Thats not the way I was trained to use HOK's wax and grease remover, KC20 is a wipe on and wipe off with a clean rag product.
I was assuming we were talking about it on a finished instrument. Not sure why you would silicone the bare wood.
Just keep in mind that waterbased systems still need safety precautions. Still wear a mask etc...
Just because its safer, doesn't make it safe or breathable.
I use a lot of Autoair automotive base coats and like them for quite a few things.
Look at the specs of whatever he's looking at, it will give a frequency range. As long as his instrument is in the specs it should be fine. I'm too tired and lazy to google the frequency range of a bass at this moment.
Biggest help you can have is buying a good iron, I'd get a Weller or Hako that you can turn up and down.
Racing rc cars we have to solder batteries all the time and they work way better for that, and its way tougher than soldering guitar pots.