This is a topic that is frequently discussed in the FSM "decals" forum.
It so happens I am working on an article on inkjet decals for FSM. Will probably finish it in three weeks to a month from now, but it takes from six weeks to a year to get an article into print from time of submission so it will be awhile. In the meantime, look through the messages in the decals forum- they stay there for a long time.