My paint mare's almost all white with two blue eyes, and I noticed she's already getting sun burned. I've tried 6 different style fly masks and they all disapeared but the next morning (the horses live on an 80 acre pasture with woods, swamp, hills. Ect). I only was able to recover one fly mask. I put sun block on her as often as I can, but her skin is still getting red and burned. Does anyone have another suggestion?