On 20/07/2020 10:49, Andrew wrote:
There is an aluminium extrusion that I want to use for an LED strip
light. But, it is anodized and I want it painted the same colour as the
wall. It will be inside and 8ft above ground so well out of the way of
any knocks or wear.

What preparation would I have to do to allow it to take Vinyl Matt paint?

You could paper it first. Use self-adhesive brown paper tape, perhaps.

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Cheers
Clive