The neodymium fishing magnets are easy to rust if used improperly,they used be cleaned and dried immediately after used,then sealed and stored in dray and safe environment.The fishing magnets should not be placed where there is dust.
Yes, a double sided fishing magnet is better for magnet fishing,it can increase the search scope. We have two types of double sided neodymium fishing magnets,one of them can be also used as single sided fishing magnets
Refer to magnetic force from the size table of our search magnets,the magnetic force weight should be larger than the weight of the salvaged objects.