Have no idea, I have only used Brodak because I have a really hard time getting a good finish and it's easily available. Figure if I stick to one source, learn it's traits, make the mistakes and try not to repeat the mistakes I am increasing my odds. As far as expensive, might be but it's still a small portion of the overall cost to build one of these things. Use whatever makes you happy I'm not trying to sell anything just relating my findings.
If you are using Brodak dope might check with S&S on pricing..