Don't be afraid to paint!
I've painted plenty of 98s and A-5s with great results. I've always used Krylon primer, paint, and clear, but if going for a flat look spray can truck bed liner works great and is more durable. See my latest paint job here
Remember, the more time you take, the better your results will be! Use extremely light coats from all four sides; you should be able to see the previous coat through the one you just laid! Keep the can moving consistently so paint is not built up in one spot!
This is how I do mine. Loosely follow this. Feel free to add coats of you're coverage isn't what you want. Remember, 10 light coats are better than 2 heavy ones!
1. Disassemble and sand down stock finish on receivers with 150-200 grit sand paper. Make sure you hit all surfaces you'll be painting. Clean dust up.
2. Hit with a light coat of primer. Wait 20 minutes. Hit with another coat of primer. Wait 20 minutes, lightly sand with 300-320 grit. Clean off dust.
3. Hit with a light coat of paint. Wait 20. Light coat. Wait 20. Lightly sand with 400-420 grit. Clean. Hit with a light final coat. Wait 20 min.
4. Hit with light coat of clear (gloss, semi, or flat). Wait 20 minutes. Hit with final coat of clear.
5. Bake all metal parts at 200* for 60 minutes and then let fully cool. 24-48 hours bake another 30 minutes again at 200*. BAKE ONLY METAL. DO NOT ATTEMPT TO BAKE ANS PLASTIC OR RUBBER PARTS.
6. Enjoy your results! (Or sand down and start over)