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I need a waterproof paint (preferably a spray) to draw on my rubber diving fins. It can't be petroleum based as it reacts with rubber. Most divers use permanent markers, but my art skills are very low so I want something to spray or paint on stencil template.

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You'll need something that's highly durable and flexible, but won't decrease the performance of your fins too much.

It seems you're best off with a rubber(izing) paint or rubber coating/liquid rubber, which is "heat, chemical, weather, and impact resistant, as well as being flexible". Last but not least, according to the linked page, since they are "water based and VOC free, these products will not harm you or the water table".
They are a little hard to find as coloured paints, though.

Be sure to test your coating or paint on (similar) rubber before applying it to your fins, and to clean the fins (using water and soap) for improved adherence (I suppose sanding the rubber is out of the question).

You can read through this thread on scubaboard.com, as it has a few good tips and alternative approaches, or this thread on whitearmor.net (a site aimed at stormtrooper cosplay enthousiasts), where they talk about painting rubber boots.
Looking into cosplay forums can generally provide good alternative ideas.

I suggest using your favourite search engine to look for a proper product if the ones mentioned on the linked websites or in the linked threads aren't to your liking.
A good candidate might be Plasti-Dip, as it is available in multiple colours, but I'm not sure if the peelable nature of it means it will slowly peel off of its own accord. Fusion All-in-one from Krylon also seems to work.

Alternatively, you can use stencils to decorate your fins using the permanent markers.

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  • I checked out rubber paint and it seems that it's not made to bind to materials and it's supposed to be peelable. Won't that be the case when used on rubber? – Islam A. Hassan Aug 10 at 9:01
  • I've updated my post while looking for an answer to your question, but have been unable to find one, unfortunately. I suggest trying out the Plasti-Dip, since it's not very expensive. – Joachim Aug 11 at 19:02
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    As a caveat, plasti-dip smells VERY bad! Be sure to use it in a well ventilated area! – Allison C Aug 11 at 19:36

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