This may help. Got this from Micro .
The last one is interesting for old
decals.
"Micro Sol setting solution is for the most difficult irregular surfaces you find on models. It completely softens the Microscale Decal allowing it to drape down onto the surface of the model conforming perfectly and without distortion. You can get the most amazing results in seemingly impossible places, because Micro Sol actually makes the decal part of the paint. For that reason you should coat Micro Sol on for only a few seconds and then leave it alone, it does the work. Do not touch until dry as the decal is very soft at this stage and could be easily damaged. "
"Micro Set is a very versatile decal setting solution that does several things to the Microscale
Decals to improve application. Micro Set should be applied to the surface of the model where you will be sliding off the decal. Micro Set prepares the surface with special wetting agents that cuts the oils in new paint and converts the adhesive on the back of the decal to a stronger and more lasting one. And finally, Micro Set slightly softens the
decals film to make it more flexible so that it can conform better to the model's surface. Better adhesion by the decal to the model prevents tiny air bells from occurring and results in an invisible carrier film or the so called 'painted on look'. "
"Everyone should have Micro Liquid Decal Film who models and uses
decals. Especially if you have been at it for some time. The typical decal scrap box is not the best place to store
decals. Exposed to air, sunlight, and moisture, great swings of temperature or general abuse, and
decals will go bad. Or maybe you just always had trouble putting on thin stripes. Micro Liquid Decal Film solves all of those problems and makes a decal which for whatever reason is bad, work again just like new almost immediately. Of course if you have already put it in water it is too late. So if you have some old
decals you really have to use, coat them with Micro Liquid Decal Film to be sure. Or if there is any indication that you might have a problem, don't take a chance, you can solve the problem on the spot. Simply take a small brush and coat the image on the decal you want to use. Allow to dry for 20 minutes. Apply the decal as usual. It's that simple.