Micro Superfilm

It's been my experence that a lot of the time when a decal set gets older the decals will absorb moisture out of the humidity of the air (usually around the edge of the decal) and activate. Then the glue won't have the strength to hold the decal to the surface. (It can get so bad that the decal will be glued to the sheet and won't even lift off the paper)

When this happens to me, I've had good luck by soaking the decal in a 50/50 mixture of water and white glue (Elmer's works well). Have even applied it to a decal that has already been installed. Micro Sol and Micro Set will also help in sticking the decal.

Hope this will help.