Most mini sticks are made of polystyrene (PS). There are a many screen print inks that work well on polystyrene. I have had good results with Nazdar 59000. If you are pad printing them I would recomend Marabu TPR.
I have Printed on Standard Plastic Hockey Sticks and the wood sticks for almost 2 years using Rucco ink pe180 series works great without any hardener That is if you refer to the USA stick the China stick tends to have a slicker surface and might need a pre treat like corona befor eprinting
most of the problems come from the fact nobody knows for sure what type of pellets go into china products....USA USA USA
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Our InkFlexx inks print on a wide range of substrates. Let me know what type of plastic your sticks are made of. Visit our website at www.inkflexx.com, or give me a call at 416-438-3901 for guidance.
Regards,
Ray Murphy
Pentex Print Master Ind. Inc.
Toronto, ON, Canada