Your biggest worry about being fuel proof is the nose area back to the wing roots. Finish up the model in dope like you have been doing. When finished with all dope applications, spray the nose area with an even coat of the two part clear. Even if you wanted to spray the two part stuff over the whole model, it doesn't need to be applied that heavy, just enough to cover, sand out a little bit then rub out. If you have come this far with silk and dope, it would be a shame to strip it all off now. Don't worry about there being an edge or some kind of demarcation line with the two part clear, just spray and even, light coat and it will all blend in, especially if you sand it very lightly and carefully before any rubbing out.
Type at you later,
Dan McEntee