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I hate to disagree, but, a lot of times, on older decals, I have found it necessary to give the decals several coats of clear to hold them together. This, of course, must be done in light coats. After a surface has been built up and all is dry, the decal must be trimmed closely. I imagine it also depends on what brand of decals. It may well depend on the brand of clear, also. It's always best to try a test shot first. I've had good results with enamels and laquer based clears. Acrlyics are a little tougher, being "water soluble". Everyting in moderation. Just another opinion.