Garage door painted with sandtex!!! how to remove?

One of the previous owners of my house had painted the double garage doors with Sandtex (spit, spit).
I now want to get rid of it and put a smooth hard wearing finish on it instead of one that catches all the kack and takes your skin off if you rub against it.
I thought about getting one of those paint removing wheels (plastic ones) that fit to an angle grinder and giving that a go.
However, before doing something that I might regret later, I thought I would check here.
Any suggestions?
Rick....
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Not sure, but wouldn't the sandtex wear out the paint removing wheel rather quickly?

Nitromors? Usually a chemical weapon on the paintwork can reduce the work content rather a lot.
Or hows about a heatgun to melt the old paint off?
PoP
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Rick wrote:

I'd say nitromors and a pressure washer off hand - never tried it tho.

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