Used to use transducer paint but vendor stopped stock it.Now I leave depth sounder on 24/7 Except on hard. My thought DS Pulses MAY KEEP CRITTERS OFF IT.Who knows. It reminds FB state of tide at dock showing me what water Is under the keel Safe cruising Sent from my i-Pad Chief Engineer Bob Kovach (KJ4UGE) FOR SALE M/Y ALLEZ! 1992 MT50 WIDE-BODY Visit (https://tinyurl.com/y83m925f) Visit: https://www.boattrader.com/boat/1992-marine-trader-50-widebody-7286542/ (Gold Looper) 5-2-2016 MTOA2631, USCG-CWOA, WRCC, AGLCA1979