The Tamiya masking tape is super cool though, from Japan and the best I've ever used. 3mm Fine line tape is okay for bigger stuff but you can't get the curves on these little shells so I use much thinner paper tape, I think they sell it down to 1mm in size so ideal for getting stupidly thin lines
I get it from
here You won't get a super crisp line with it, liquid mask is still the best stuff for that. Tamiya tape should see you well though, I've seen painters cover whole crash helmets in that stuff and draw on it and then cut the design out.