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7

You could cut up an old bike tire. Cut off the sides, and you have a nice strip of actual tire tread. There are lots of different sizes of bike wheel, so you can customize the depth of the tread by choosing between road tire (skinny tire, shallow tread), off-road (much wider tire and deeper, bumpier tread), hybrids (a cross between road and off-road) and ...


6

While I've voted for the answer suggesting bike tyres, here are some alternatives: There are vinyl products that can be painted on (or dipped, but painting is better in this case). A couple of coats of black Plasti-dip, the brand I have here, would work nicely. Cylindrical pieces of black latex of the right sort of size are available - drysuit replacement ...


2

Acrylic paints, or modified acrylic paints, are often used to color latex, but not for what you want to do. Latex is a little finicky. Many colorants will cause it to do unwanted things, like coagulate quickly into a sticky, gloppy mess, fail to dry properly, or change its characteristics. There are colorants designed specifically for latex. My ...


2

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 ...


1

There's a technique I've used for a similar requirement that doesn't require thermoforming or vacuum forming. You end up with a flexible, rubbery dome (or other shape per the mold). The first step is to stretch a stretchy cloth material over the mold (needs to be a convex mold for this, where you can stretch the cloth over the outside). Stretch it where ...


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