I was just about to post the same question when I saw this thread at the top.
I'm using testors decal solvent with no setting solution, and I found that after multiple coats the decals still wouldn't settle into the panel lines, so I cut them with xacto but then they disengaged from the plastic and dried. yuck.
any advice, should I ditch testors and get microsol? The decals were from the kit from Academy, are they bad? What happened?