Hi. I consider myself a pretty experienced modeller, but I have never had a problem with any decal softeners except the 'new' DecalFix by Humbrol.
I used Tamya acrylics sealed with Future and this softened them both and eventually going through to the bare plastic (I even primed the kit with Tamiya surface primer)
Has anyone else had this type of reaction? All paints/future totally dry at least 24 hours.