yes it is possible. you have to be meticulous with your cleaning prior to applying the decal. I have gotten pretty good with them and have found that a light coat, (2-3 with thin), of CA and smoothed out with mm prior to application works best. then i clean thoroughly with DNA and let dry for at least 30 minutes. then when applying decal you must get all of the air out, and squeegee the water out so that it is perfectly flat on the item. Again let dry thoroughly, i wait about 2 hours. When applying the CA start with 1 or 2 very light passes prior to starting full CA finish. Use plenty of CVA layers on the finish. I always use thin and put about 12 to 15 coats. Then sand, MM as normal. Here is an Exampole of one of my decals. The maple leaf on the flag is a decal. The decal extends about 1/8" all the way around the maple leaf. even with a magnifying glass on the pen i cant find the edges.
Good luck, and remember the most important thing with decals is being meticulous.