We frequently get threads about failures to get decals to perform as we'd wish & I've often posted a similar response to this post as a reply. I think it is worthy of having a thread on the subject pinned for the benefit of all who wish to learn or to refer those who post such queries to be referred to.
Klear or equivalent, henceforth refered to as KOE, is flaming brilliant for bedding decals, in my experience any decals. I've never used a Sol/Set system & never had a fail other tha