Does any kind person on STW live in or near Monmouth and have a small amount of tubeless sealant I could have.
This is not in the bike forum as it’s for an inflatable balance cushion that I ordered to help my back problems, and arrived with a pinhole in it. They sent me another one, but if I could repair this one I could have one in the office and one at home.
The cushion is made of flexible plastic, is it likely to work or will it only work with rubber?

you could try a small dab of super glue, it should form “riveted” plug that may seal it.

Thanks Klunk I may give that a go.

Clear selotape

inflatable balance cushion

Of course it is.

A weldtite ‘anchovy’ might be better than tubeless sealant – but I’m nowhere near Monmouth.

I have some in Newport , but you would probably be better off glueing a patch on it like the repair kits that come with air beds

Yeah lots of things I’d do before sealant.