good replacement for the extinct bullfrog surfer formula [SEP] i was a long time user of bullfrogs surfer formula bullfrog discontinued it and the replacement did not come close in ease of use and effectiveness i did a search hoping to find a hidden bsf supply none to be found but i saw a reference to doc martins nextgen hmmi decided to buy it the product arrived my first reaction was a little skeptical it is easy to apply it works for hours and hours it stays put but it is easy to remove when you want to remove it i expect to be a repeat customera pleasant surprise was receiving a personal e mail from the seller checking on my satisfaction old school customer service which i appreciated