What guitar is that? looks pretty cool man.
Anyway, since you're doing sanding sealer and stains, you need to make sure you get ALL the old sanding-sealer-of-doom off the body. You can check your progress by getting the body damp. If it discolors from the rest of the body, keep going!
This may sound redundant, but it may not be all visible to the naked eye if you got it all or not. I've made that mistake more then once.
(p.s. when I say damp, I dont mean stick it under a water faucet, I mean getting a towel damp and wiping water on lol)