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...Presumably it only works well with dark print on light enclosures though?
I did a couple of pedals with the clear PPD suff (same as @Adam_MD) and found it more prone to show bubbles and other artefacts, but now prefer to use the white PPD stickers as it is thicker.
Yep, I'm using the white PPD stuff too. Good results. I have some white waterslide stuff too, but haven't tried that yet. I would have thought that the clear stuff wouldn't print as well, but if that's not the case I might give some a go. I quite like the idea of being able to see the enclosure's colour through in the voids. Presumably it only works well with dark print on light enclosures though?
Cover them and watch out for flecks of lint, and bubbles that mysteriously appear from nowhere. A lighter flame can sort them out, but don't try that after an hour as it gets more sticky. I bought a BBQ lighter thing from B&Q but stopped using that as it gives a black smokey flame that marked my ET.
Oddly haven't had any bubbles whatsoever through the process after the initial pour.