Minifish Rudder

John – 

Got the rudder blade today – perfect fit and beautiful work and I appreciate the dowel reinforcement at the top.  
I have to refinish my centerboard now and would like it to match, and was hoping you could tell me what finish (polyurethane or varnish and what brand)  you used on the blade.
Once again thanks for the great work.
David
Allentown, N.J.