Just purchased a Welsh slate the was sold as a "Welsh Thuri". i am new to naturals so i checked around with different people to see if such a stone would be easy to use. well, NOT for me apparently. took a shave ready razor and did 100 laps (as the previous owner had done)with water. terrible shave. definitely not an improvement. yesterday to make sure it had been really a shave ready razor i started again. tried with water, smiths honing solution, burnished the stone even. no improvement or removal of scratches.
so, before i get rid of it (not sure i can honestly sell it as a finisher), what other methods can i try to get it to work?