
One proceedure I tried was on a black walnut bowl. The inside had some gouges but I was lucky to get it clean enough to rough sand. There was two areas that were not quite right so I tried to spread some glue that had a high filler content. It was a furniture glue that dried very hard and not like the plastic glues that are so popular.
I poured some of the glue into the bowl cavity and started in low speed. I used a cedar spatula "Shingle" and just kept working the paste into the inner surface of the bowl.
Soon the paste became hard and kind of glased up a little. It was very hard to sand now so I finally just gave it a fine sanding and the inside came out beautiful.
It had a texture embedded into the glue surface that really was different looking.
If anyone is interested I will send you a photo In a jpeg size. It looks rather nice and the glue colour is brown and blends well with the walnut.
Tony