Opinions wanted.  Is it true that Lanolin (Sheep Skin) is detrimental to gun blue? Also will sheep skin tend to draw moisture?  I have a couple of gun sleeves that are genuine sheep skin and have never experienced a problem but it seems others have reported problems.

Don G

Most tanning processes also remove the lanolin as well. However, if you should wish to have a fleece lined rifle case and have any doubts, then check with the manufacturer (as long as they aren't Chinese) I see no reason why you couldn't add lanolin yourself to the wool, you can buy high quality lanolin from most pharmacies or chemists if you still have some of the latter in your neighbourhood. Lanolin impregnated wool is waterproof (That's why you never see a soggy sheep), what water you can see is on the surface of the wool, underneath the sheep is warm and dry. Wool without lanolin soaks water up like a sponge. If you don't believe me try dipping a 100% wool sweater into water and then lift it out. 

Harry

This week I made a box to store one of my Unertl scopes in. Lined the contact points with sheep skin and am concerned about rust.  Will probably remove the sheep skin in favor of something man made.

Don G

Lose the sheepskin. You might want to consider wool felt or leather saturated with a good gun oil. Also, think of the box as a secure means of transport, but not for lengthy storage.

Some tanning processes leave caustic chemicals and salts in leather. It is best when thinking about using leather to talk to whom you are buying the leather from. They will tell you what is save and what is not. 
  Lanolin will not rust parts I have used it as a rust preventive and lube ingredient for over 20 years and have never seen a speck of rust.

40 Rod