http://www.ittf.com/ittf_misc/Racket_Control_2009.pdf
Only clean your racket with water, do not use any other substances.
Adding natural substances such as oils, etc., is illegal and shall be detected.
Do not stretch your rubber; you must use the racket covering as it has been approved by the ITTF and as it comes from the producer.
相当厳しいなあ。
伸ばして貼るのもアウトか。