I do exactly as described in the link above but I use Mr Mark Softer by Gunze Sangyo it is terrific stuff and doesn't wrinkle the decals as does Solvaset. I don't gloss coat first and find that one coat does the job even with thick decals. I then airbrush a matt varnish over the decal when thoroughly dry (at least overnight). Once dry you will never get them off (I've tried!).
If you find an airbubble trapped under the decal wait till it's dry, pierce with a needle and reapply the solution both the hole and bubble disappear.
These are both 1/72 kits with terrible decals (photos arn't great either).
Hope that helps,