Does weather effect decaling like it does with airbrushing

It may be a bit late now, but you can apply a coat of Microscale Liquid Decal Film to your suspect decals to reduce the risk of them cracking up.

Micro Sol is very aggressive. I advocate using Micro Set first, only using the sol if the set doesn't do enough.  When you DO use sol, you must not touch the decal at all after application. It will bubble up, and maybe even crack, but should nestle down when it dries.  It is best to lay the surface with the decal on it as flat as possible so the solution does not drag parts of the decal down a slope.  With good decals I find I do not ordinarily need to use Sol on most areas, only where there are louvers, bumps, or something like that that have a lot of surface curvature.

I usually have problems with high humidity... Just a guess but i think dry air wouldnt hurt.  When i open a kit, i put the decals in a zip lock (if it will fit) with a moisture absorber (aka the do not eat pouches).  I built two models from italeri, one from 2004 and the other from 2005.  The 2005 shredded pretty bad so maybe the quality from each batch is inconsistant.