Alas, it is time to finish this bass. Before I do, I do a pre-finish assembly to make sure that every thing works and is still in the right place. I actually wired her up for awhile as the customer came to check the neck for fit and to basically hear the electronics we have selected. He approved of the neck shape and thickness. It is always better when the customer can get their hands on the instrument before you go through the finishing stage. That way, changes can be made.
These next three photos are of the bass dry without anything applied to the wood. I have filled any voids in the Burl Maple with epoxy mixed with a little tobacco dye. Then I sanded everything out before I assembled the bass. The first picture shows the ramp the customer wanted me to make for this bass.
These pics are with some naphtha applied to show the colors and grain of the wood. Big difference.
So the next step I took was to disassemble the instrument and sand once again with 320 grit sandpaper. I take care to make sure that all of the trouble spots, like inside the horn, get hit with the sanding. I apply some naphtha to see any scratches that need to be addresses and to remove any skin oil from the handling of the bass.
I then use some of this Seal-A-Cell varnish to coat the instrument. You have seen me applying this after applying some sealer/ pore filler and sanding it back. I have been finding that the finish I use, by itself, builds quick enough, and works well enough, to be the filler and finish. So I have been skipping the filler step and have been having good results. I use water based poly (General Finishes brand in the dark blue can) in the gloss sheen for all of my instruments. Since the finish is water based, it does not make the wood pop and show the nice color like oil or solvent based products do. So to get the wood to pop, I use the General finishes brand Seal-A-Cell you see here...
This product is very thin, dries hard, and penetrates deep into the wood to bring out the grain and color. It also keeps the grain from lifting when using the water based product. General Finishes tells me that the Seal-A-Cell, when properly cured, is compatible with the water based poly. So far I have had no issues with it. I apply a good coat keeping the surface wet for a few minutes. I do wipe off any of the Seal-A-Cell that puddles once the wood no longer wants to take any more. I wipe it on with a blue shop towel changing the towels as they start to leave debris.
I let it cure over a few days. The longer the better and as Bob Flexnor says, "What they say the dry time is on the can...double or triple it".
After a couple days I look to see if there is any dry spots that need more sealing. I may then apply one last thin coat and let it dry for a few days more.
Here she is in my drying rack. There is a fresh coat on so it looks shiny. I don't worry too much as I will lightly buff it with an abrasive pad to knock back the sheen. I want it dull so that when I apply coats of finish over top, there are no shiny spots underneath that show.