Reddit mentions of Dupli-Color Scratch Filler& Primer Gray, 11 oz

Spray the print with a filler primer, sand it, rinse and repeat until the surface is to your liking. Then do a coat of matte primer (Make sure you test the two primers to make sure there won’t be a reaction). Then just acrylic paint.

If you cannot find it in a local store, you can order it online:
https://www.amazon.com/gp/product/B000B6DG7C/

Never used that website but seems expensive.

Amazon has this kit which seems nice because it includes clear coat. Just make sure you get the correct color. Even a color match will have a variation in the color. Be prepared, you will see the fix.

Then you just need a primer Try not to sand to metal.

awesome information, thanks!
is it this product: http://www.amazon.com/Dupli-Color-FP101-General-Purpose-Sandable/dp/B000B6DG7C/ref=sr_1_1?s=automotive&ie=UTF8&qid=1334844429&sr=1-1

Step 1:
https://www.amazon.com/Sandpaper-Furniture-Finishing-Automotive-Polishing/dp/B01LZ6TG05/ref=sr_1_4?keywords=sandpaper&qid=1570513551&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-4

Step 2:

https://www.amazon.com/Dupli-Color-EFP101007-General-Purpose-Sandable/dp/B000B6DG7C/ref=sr_1_3?keywords=primer+filler&qid=1570513585&refinements=p_85%3A2470955011&rnid=2470954011&rps=1&sr=8-3

🙄

Dupli-Color FP101 Gray General... https://www.amazon.com/dp/B000B6DG7C?ref=ppx_pop_mob_ap_share

This worked very well.

http://www.amazon.com/Dupli-Color-FP101-General-Purpose-Sandable/dp/B000B6DG7C

Spray, sand, paint.

Example results (not mine): http://forum.typeamachines.com/viewtopic.php?f=8&t=195