About three weeks ago I cleaned my head real good. Sprayed on camp dry( spray used to seal tent seams 13% silicone) 3 coats letting it dry between coats. Normal I can run my 1500 on sensitivity 9 without falsing. If I hit wet grass sometimes I back it off to 8. With the camp dry on I can run it up to 11 and at one point to 12. Went back to a sight that I hunted several times with the new sensitivity settings at 11 and dug out a 1877 fifty cent piece and a 1943 Quarter . Is that possible.The water just beads right off. Seams to be more stable at higher sensitivity settings.