Quoted from DaveTheTrain:The description just says
"Precision Cut Insert Decals, just peel and stick.
High Quality Print!"
I suppose they are just stickers going by that? When these companies make decals like this do they intend you to stick them directly onto the playfield and do nothing else?
I had similar for Diner but I put a pf protector over the top so didn't worry about it.
I am intending to scan them so I have the ability to make some waterslide decals in future and have backups.
I know of some people who have sprayed a thin layer of clear over an area where they have used decals. But I'm still unsure what kind of decals suit this, if any.
Also, if scanning them I suppose I could use them for now and see how they last?
Keep in mind those stickers are the full heart image, so they cover more area than just the insert. That means you'd want to either fill your insert with something first (to avoid a dip, but you're left with a bump), or cut out the portion of the sticker that can fit inside the insert. In my minimal experience, the sticker thickness has been comparable to the insert depth--in other words, there's a good chance that once you put the sticker on the insert, it will be level with the playfield.
If you go the waterslide decal route, you can take a look at using a UV resin (e.g. solarez) to spot-clear the insert. It goes on thin and cures with a UV flashlight in a few minutes. It's not going to win any beauty contests though or turn your playfield into a collector's item.