The concept isn't to sand it down completly, but to roughen it up so the primer coat will 'stick' better. Some markers have a annodized finish that's glossy and really smooth. If this was painted straight up, the paint would be more prone to flake off.
The powder coat on your 98 doesn't need taken all the way off, it only needs sanded a little. I used some 600 grit on mine, wet sanding by hand. Make sure you get all the dust off after sanding, and that it is completly dry. Also don't touch it if it can be avoided because the oils form your skin can mess with the paint.
Stick to the guides in this sticky the rest of the way through and you should be fine.
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What grit sandpaper should I use for sanding?
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The fine stuff, 1000 or so mostly. For the primer you might want rougher, in the high hundreds depending on if you have high-build primer or what.
Clearcoat is probably the best best to stop chips. If there are no plastic parts involved, you can try baking the painted parts at maybe like 150 degrees for 10-15 minutes. It's supposed to harden the paint, but I haven't tried it.
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What is clearcoat and what does it look like?
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Clearcoat is mostly like a clear paint. It adds layers on top of the color to protect it.
What it looks like after it's painted depends on what kind of paint you use.
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Will it be okay to get my marker wet?
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Unless you've went and used some cheap latex house paint, it'll be fine in water.
Edited by Alpha. Thanks for the contributions Torch!