IMO when building calluses, three 10-minute practice sessions are better than one half-hour set. Take it slow, the calluses will come.
There is 'stuff' marketed to put on the fingertips and some 'things' to wear on the fingers/hand. Swabbing alcohol on the fingertips has been attributed to Kieth Richards. I would avoid it all, and just keep playing; [u]gradually[/u] increasing your playing time. YMMV.
Good luck, have fun.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins
