[chrisguyw]

Hello Kev,.... a couple of questions/comments.........

How long did you allow the decal to dry ??...if a larger size decal is not fully dry (a couple of days) even a light coat of lacquer can react with the moisture under the decal and cause this bubbling effect.

Some lacquers are "hot" and will cause this effect if applied too heavily.....while you did indicate you applied a light coat, I find a few initial "mist" coats (30 mins. in between) do the trick. I  now only use Tamiya spray lacquers (as Hot as they get) and have never had an issue using multiple mist coats with 30 mins in between.

While Future/Pledge is an acrylic and will not attack/ruin decals, and is cheap, and easy to apply,...it is far from robust, and therefore not the best choice for slot car bodies.
It is however a good barrier,...and a coat on top of your decals before applying lacquer is a good safeguard.

As far as fixing what you have........you can apply a few coats of Future or Some Tamiya clear acrylic (not lacquer) ,...lightly sand and re-apply/re sand until smooth.

Cheers
Chris Walker