Echi wrote:At the beginning nitro finish, here in Europe was sometime given by hand through French polish system.
It was also common to mix both nitro and schellach ( I found the method in a n italian manual from the sixties).
For insatnce I know an Italian brand ( Sayerlack ) that is actually producing a very good nitro finish with the specific pourpose to be French polished. Actually the solvent is alcohol and not nitro thinner and it works great.
The procedure is the same used for the schellach.
Someone told me that in Spain this is a procedure well known.
I'd be interested in knowing more about the Italian method that you cite. I'd be a bit suspicious, however, that the Sayerlack is actually nitrocellulose because nitro is not ordinarily soluble in alcohol. I just tried a little piece of nitro binding and it was not affected at all by alcohol. That said, I've had a very well known luthier recommend that I try a mix of nitrocellulose lacquer and shellac in French polishing cedar tops, the objective of course being to lay down a tougher finish via a padding method. My attempts were not particularly successful because I had trouble keeping both the shellac and the nitrocellulose in solution. It seems to me to be quite a juggling act to get the mix of solvents right so that both solids stay in solution. If you have any insights on this I'd really like to hear them.