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http://www.dfg.ca.gov/news/Question: I have heard that using WD-40 as a fish attractant works well. Is it legal to use? There seems to be much confusion as to what is actually in WD-40. I would also like to know if the sunscreen I put on before entering the water is hazardous to marine life.
Answer: It is not legal to spray WD-40 on your fishing lures as an attractant. The same goes for any substance that may be harmful to fish (e.g. sunscreen).WD-40 contains petroleum and is specifically prohibited by law to be deposited or introduced into the waters of the state (Fish and Game Code, Section 5650). When it comes to sunscreen, I would just try to use discretion as any foreign substance, even sunscreen, may carry chemicals that may be harmful to fish and other aquatic life if introduced in large enough quantities.