How to make a sanded surface shiny again?

After sanding a plastic surface, the surface gets dull and sometime you like to keep the original shiny appearance.
Also after cleaning some bubbles on the surface by a sanding operation, the below is a nice fix of the surface.

- A sanding paper with a grit of 180 is used for sanding the plastic surface. (Do a few experiments what works for you.)
- Take a gas torch and carefully wipe with the torch flame over the surface until shiny. Its easy to burn the surface, so be careful and use smooth wipes as if you are paint brushing
- here you are, job done

Good luck see picture below


Sanding


Flaming

If it is ABS then you can just paint it with acetone.

Tetrahydrofuran (THF) can smooth PLA in the same way that Acetone can smooth ABS, or you can use the solvent they use to wed PVC pipe, which is available from most DIY stores, dont even need to sand down first

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Thf smooths but it also dulls the color......