We’veCarr & Day & Martin have developed a solution to reduce reliance on a spray and still keep flies away from your horse.. Their brand NEW FLYGARD® Extra Strength Gel. The perfect partner to theFLYGARD® Extra Strength Insect Repellent Spray. Based on the same formula as the favourite fly spray our new Gel allows you to apply by hand or sponge for greater coverage. The concentrated application of gel contains 10% DEET for optimal, long lasting protection for a more accurate and alternative application ideal for faces and, ‘spray nervous’ horses.