Put my spare white forks on my black bike.
They would certainly look better in semi matt black. What rattle cans have proved chip proof for you ?
Are you set on rattle cans? I'd drop them into a pro and have them blasted and properly painted or powder coated.
If you say where you are somebody could recommend a friendly local paint place.
They are off my muddy bike. As long as they are black from a distance I'm not too precious.
I've had pretty good results using "appliance paint" though it's gloss not matt.
Paint then Matt heli tape?
If that's the case, I have used something like this on motorcycle forks before - 2 pack
It looked good and was fairly chip resistant but for the amount of prep and work I put in, I said I'd get it done properly next time.
This stuff is supposed to be more durable than most, might be slightly more difficult to apply though:
https://smile.amazon.co.uk/Autotek-ATOOTBB500-Truck-Liner-Spray/dp/B079YSY8Y8
edit, not sure why the site always insists on linking to a kindle preview when this is supposed to go to some Autotek ATOOTBB500 Truck Liner Spray
I might be wrong, but I seem to remember reading that fork lowers can't be powder coated, as they're made from magnesium, and that doesn't like the heat.
Following the thread,though, as my previous attempt chipped after about 5 seconds.
What about black vinyl stickers? Quick, easy, cheap and easily removed.
We used spray.bike black on my son's bike. It held up really well given the amount of abuse.
https://www.bricklanebikes.co.uk/bike-paint
That truck bed paint looks like the biz.
Matt black Barbeque paint.
It's heat resistant for when you do those sick jumps through flaming hoops...
Did a few BMX's back in the day with Hycote Stone Guard. That's matte black and not fussy about preparation.
I remember it being an absolute pig to remove as well as it's very hard stuff.
Rustoleum combicolor is pretty tough,or they do one called 'hardhat' which is supposed to be even tougher.
When I had my last frame powder coated I was told they couldn't do the fork lowers because the heat might damage the bushings.
Spraymax 2k hot rod black.
Use ppe.
(Eastwood 2k in a can might be easier to get in the UK)
though that particular type may not be, truck bed liner is usually like sandpaper.
I wouldn't use bed liner. It's tough but it's usually crinkly.