I've finished decaling the Tyrrell. It's the most complex decal job I've done for some time. I'm actually really pleased with the result, and I've managed to get away with the problem I had with melting a couple of spots on the white background.
Misty - there are a couple of reasons why I didn't spray the white background. Technically it would be difficult as there is a thin red outline around it, and I didn't think slicing that off the decal and making it look good would be any easier than making the decal fit.
Being a lover of racing cars, I can foresee plenty more difficult jobs, and I wanted to master a better technique than I already have for making decals conform. Having said that, I used the hairdryer extensively through the remainder of the job, and found it easy, and quite safe, it's just for the first one I didn't understand the limits. There was actually plenty of margin for error between applying enough heat to do the job, and applying too much heat that damages them. In future, I'll be careful of that and probably test for each set of decals before I do it on the most obvious decal on the car :)
I use a product called Mr Mark Softer, and also have Mr Mark Setter but I think are made by a Japanese company. Last time I need a new supply of decal setting agents, I could get Microsol or Microset at the LHS, but these seem to be pretty good products anyway.
I took some photos, but didn't have time to load them up before work, so I'll do it tonight.
Cheers
Tony