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I want to put 2 sessions on a top of blonde and then mask off the rosette and top purfs and then put a couple more sessions of orange shellac or Siam seedlac for toning and then unmask the guitar and put 2 sessions of blonde on top of that. My question is , will the top 2 sessions of blonde cause the siam to bleed / blend over the rosette and purfs as I apply the last sessions of blonde? I'm thinking it will but not sure so I thought I'd ask.

Yes. Bleeding is not what will happen but rather inter mingling caused by the eventual spiriting off that will be required. The whole thing about French polishing is you melt one session into the next so there will be bleeding. How much is dependent on your boding and spiriting off. Not a well though out scheme for FP in my opinion

There is another issue other than drawing one shellac color into the other and that is it you are planning to use masking tape the alcohol will draw out the adhesive from the masking tape everywhere your muneca touches it and contaminate the film and you outer pad with this adhesive.

Well I was going to use a frisket film and some auto pin striping tape. I now have painters tape masking the bridge and have 2 sessons of blonde on the top. I don't want the amber to go over the shell as it makes the nice blues look green which I'm not keen on. I was thinking of top coating with nitro for protection and using the FP as a thin layer of shellac. If I go that route then I guess I'll just leave the masking on until the FP is done and the nitro should level out the difference. What do you think?
I probably should have just stained the top and went with all blonde. I suppose I could sand back the 2 sessions and stain.

Personally I agree that if you wanted the top wood to be a different color then you would have been better off to stain the top before FP started. I think if your are going to cover this with nitro I would stop where your are and consider that your sealer and just spray nitro form here out. Or you could spray shellac for that matter. But you will not end up with a French polished top because too much of the process will need t be circumvented.

If you do decide to cover this in nitro then I see no need the FP over it because the top will sound like a heavy nitro finish. Better off just to add the color to and finish the top off with nitro. Then the masking and such is no issue.

This is pretty much an exercise in FP for me so I'm playing around with a lot of ideas and I might not spray it yet. I kind of like doing this so far as I have a hard time not over doing the seal coats when spraying shellac and there is all the gun cleaning and so on. I'm thinking of sealing it this way in the futher as I can get that nice thin shellac base. I've been pretty much using Robbie's method and modifying it somewhat with some of the traditional technics. I'm finding out what is working for me as I'm learning. I like the fact that I can do this while listening to music and drinking a smoothy(with a shot or two of Everclear added to it ) as I go. It also gives me time to think about what jigs I can make and my next step on the build.

I like not-so-smoothies

As shellac has such good adhesive properties to other finishes what would prevent you toning the areas you was with the coloured shellac, sealing that with nitro the carrying on with shellac over the top if you just want an FP finish purists may flinch and there may be technical reasons not to but just a thought.

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Formerly JJH

I learn more from my mistakes than my successes

I would put nitro over shellac for the protection and hardness properties. Shellac over the nitro would serve no purpose.