I was kinda keeping this to myself because so many have advocated using Nitrate for the substrate it has to be something I did wrong.
I have always used Brodak Butyrate from the wood up and have had reasonably good luck when I didn't screw something up. Never had a problem with fillets lifting, carbon veil went on and filled very well with a couple coats of ZS filler etc.
Well I tried using a Nitrate base on the Somethin'Extra fuselage because everyone told me it was more sticky. I'll never touch the stuff again and in fact gave away what was left of the quart can along with the thinner. What a nightmare, the CF didn't stick and didn't fill even after 4 coats of filler and much sanding, every fillet lifted and I spent over a week sanding and grinding to try and fix the fillets.. Finally ground them all out and replaced them with new Aeropoxy.
I have no idea what happened but it's the worst looking finish I have ever done using a dope base. I'm not going to take any time to try and find what went wrong as I know my 60-40 mix of Brodak Butyrate will work and work well. The fillets now look Ok but the nose looks like a prune and it's going to stay that way as I am tired of trying to fix it.