Nodlac,
What do you mean by a blotchy finish? Do you mean some patches were glossy and some weren't? Maybe the Future was applied a little unevenly - that could make gloss sections and semi-gloss patches on the model.
I've had fantastic results using Future................here's what I do.........
I apply 4 or 5 very light dust coats - 3 or 4 minutes inbetween coats is ok - it looks terrible at this stage - very flat, no gloss.
I then hit it with a slightly thicker coat (a wet coat) - this should start to gloss the model. Usually one more wet coat is enough to produce a uniform gloss coat all over the model. The stuff is kinda strange - it always seems you have to apply WAY TOO MUCH to the model to get a gloss, and if you applied paint the way you have to apply Future, I reckon the paint would end up about 2mm thick. There's a fine line between just enough and not enough Future.
Try experimenting - paint an aluminum can with the topcoat you plan on using on your model - then experiment on getting a great finish with the Future. Then use your newly found skills on your model. You'll get there.
Cheers,
LeeTree