Until recently, Brewers pitch was still being used, however, it has been
determined that it contains carcinagins so users have switch to bees wax. 
Brewers pitch is a black substance that sets hard, looking like  black plastic,
great stuff.

Just my little contribution to the discussion,

Carrick 


                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                   

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