MCMike.
Sounds about right to me. I will usually dope the frame until I can see a slight gloss. Then I know it will not soak up any of the color coat.
Here is Thai Silks.
http://www.thaisilks.com/store/merch...tegory_Code=20
Nitrate dope sticks to just about everything, and you can put just about anything over it. Not true with butyrate dope. Also nitrate comes in taughtening and non-taughtening; butyrate also comes in taughtening and non-taughtening.
Whatever Sig is selling is not traditional butyrate, it is some formulation, and you must use there reducer. Their reducer eats everything that I have tried to mask with, so I threw all that I had away.
Les