for those interested here are a couple examples of Urushi to better describe what i am talking about.
This one is in mid coates on Malley root for a valve amp that I am building. I am using clear urushi which is actually a dark brown colour, but application are so fine that is doesnt stain the wood.
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THe next picture shows a finished shakuhachi made a bamboo.
with these methods the urushi is applied by using a small square of silk or other lint free cloth, put a couple of cotton balls in the middle and fold up the corners of the silk, twist and tap to form a small pad. Apply a small amount of urushi in small circles with a small amount of pressure, similar to french polishing, you then wipe very lightly in direction if the grain.
There a numerous procedures to go through but this will give you a general idea.
Cheers