Here are the steps I follow for sanding props, like the blade of my Dan Heng spear. These are only meant to be general guidelines on what to do; add or skip steps as you see fit!

1. Wet sand with 80 grit
   • This is to remove layer lines that are usually visible on 3D prints.
2. Apply even coat of filler primer
   • Ideally, you spray many light coats that eventually build up into one even thick coat
     • You risk primer or paint pooling in certain areas if you try to apply a thick coat right away, which might end up gummy instead of dry
   • Add extra filler primer where there’s cracks or pinholes or other imperfections you want to fill in, but watch out for pooling
3. Wet sand filler primer with 100-120 grit
   • Only sand the filler primer until it’s smooth. If you can see the underlying plastic, you’ve gone too far and should reapply filler primer in that area
4. Apply even coat of filler primer
5. Use Bondo to fill in any cracks or holes
6. Wet sand filler primer/Bondo with 180 grit
   • I’ve found that sanding Bondo with anything less than 180 grit will quickly remove the Bondo instead of gradually sanding it down
7. Apply even coat of filler primer
8. Wet sand filler primer with 220 grit
9. Apply a layer of white acrylic paint as a base
   • I use acrylic, but you can use whatever paint you want
10. If everything looks good, start painting
    1. If there are still imperfections, add some acrylic paint and sand with 600 grit. Repeat until you’re happy 👍