Ron
Can you post a picture of the spot? If it's tanned i don't think stop-rot will help much. I think the biggest mistake most begginers make is not let the hides salt dry completely, 2 weeks minimum, Then rehydrate with a bacteriacide then pickle shave , nuetralize then apply the tan, I don't have to deal with all that, I flesh then put in my auto- tanner then shave and put back in with the tanning oil, Take out shave again, then i prep tumble and mount, I have tanned about 1000 capes and life size animals and not one lost to slippage, If your serious about becoming a full time taxidermist i would check out the auto tanner. You can pick up a used one fairly cheap $600 on taxinet, The best part is you don't have to worry whether or not your cape will slip
