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I have made some movement trays and painted them with acrylic house paint. I find that they were fine however after being stacked together in storage when I come to use them the paint on one tray will stick to the next (yes, they are all dry), when they are separated it often means that the paint is ripped off one of the trays.

I was wondering whether there was something in the paint causing this and if so whether someone knew how to fix it?

Sounds like the paint didn't adhere properly. Did you use a primer? That'd help. Also, make sure the trays are clean (soap-n-water), and maybe rough up their surfaces a bit with some fine grit sandpaper to give the primer a hand.

Some "exterior" house paints also take up to two days to fully cure, so that might be the culprit, too, if you stacked them too soon.

Hope that helps!

A coat of gloss varnish can stop that from happening, it is just acrylic paint taking a long time to completely cure - even if it is dry. Even once cured, different paints can do different things when in contact with other items. Baking paper between them, or heavy gloss varnish

Thanks for that. The time to cure seems exceptionally long (e.g., it happens even though I painted them 4 weeks ago), I will try to varnish spray.

House paints can be like that, think it could be to do with the fact they are made kinda rubbery like to be more durable.

 Beta wrote:
Some "exterior" house paints also take up to two days to fully cure, so that might be the culprit, too, if you stacked them too soon.

Actually, house paints can take weeks or even months to cure completely.

Are you sure the hose paints were acrylic? Usually they're latex.

Generally, you'd be better off just using a spray paint.