We have used the gloss version of this varnish on many objects, ranging from sealing diamond art, spraying a wooden box that had been stained, spraying miniatures, stones and pebbles that have been decorated and painted. So many other objects have also been sprayed with this varnish. First thing to note, ventilation is very much needed. We typically do our spraying outside on a well prepared table covered with paper etc. Sometimes, if using over a paint we are unsure of, we apply a little of that paint on something disposable and test on that first. We can then gauge any reactions or shade variation etc due to the varnish. Typically we apply even coats, only applied thinly, and keep the can moving at a steady pace. The coverage is good and it is quick to dry. We often find the object is dry to touch if left overnight and completely solid, if many coats have been applied, over the next couple of days. We have had zero issues in using this spray, the gloss effect seems to be cumulative....a single coat not being too glossy but after several that is increased. Do not apply too thickly, it will have a chance of running or produce "bubbles" within the thick coats. Also it can dry a milky white is too thick. Overall very much recommended if applied with care and, if needed, test coats etc used. I hope this has been helpful.
