My sons came over the first weekend I worked on the guitar. During the intial sanding process the boys watched and had a hand in the block sanding.
Yes we all wore masks and took proper safety precautions.
I spent about 6 hours on the intial sand which when I look back might have been excessive, but since I'm not sure what it should look like, I took my time.
The next day we applied the wood filler. The wood filler is oil based so it will work better with the Nitrocellulose finish compared to water based fillers. I got a good tip to use an old credit card to apply the filler. The filler is scraped against the grain to basically fill any crevices, or big open wood grain. This is an important step with woods such as Mahogany and Swamp Ash because of the density and open grains of the wood. This guitar body is made of Alder. Woods such as Alder and Maple do not necesarrily need to be filled, however, it doesn't hurt, and it is good practice for me so I filled it.
First apllication went on easy, let it dry of 20min or so and wiped the excess off with Mineral Spirits. I let the body dry for a few hous and applied the second coat. I then let the body dry overnight.
Next morning I sanded of the excess filler and put the body away for another weekend.