Re: Jumping in
I've had decent luck with opaque fine tipped paint markers. The paint is generally free flowing enough to work on a gloss blank.
Waterside decals are good but generally inkjet printing is not as bold as I would like. If you want light colored lettering on a dark background, you'd need to use the white waterside paper as home printers don't print white. Just make the background the dark color and the text light.
I've worked with decal connection for white on clear peel and stick labels and they came out very nicely.