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Hey all, I have some resin terrain pieces im working on, and some of the undersides have this extremely smooth, almost glass-like finish to them, I was wondering if there would be any issues to be aware of trying to paint it (mostly because they dont sit perfectly flat so I wanted to make sure the edges were painted so that you cant see the bare white resin from certain angles). Should I try sanding it first? Will primer adhere to it without issue?

When resin is extremely smooth like you describe it will be harder for primer and glue to stick , but good primer is pretty sticky !

Why not just base the piece to hide the edges ?

If you have concerns what I would do is finish building the piece and once the glue is dry place a large flat piece of wet and dry sanding paper on a nice flat table and wet the paper, this will catch the nasty resin dust when we sand.
Take the piece and move it against the paper in a circular action, until you're happy, this will even out any mis-alignments and scratch up the smooth bits helping paint stick.

Resin dust can be harmful if inhaled so I always try to use wet and dry paper.

Hope that helps!

If you are worried about it not sitting flat you could always sand it down.

take a super flat surface like glass or a polished stone tile, tape a sheet of sand paper and do figure eights on it with the base.

if its anything like i think it is then its going to be a bit concave so only the edges will get sanded so you dont have to go that far.

Edit: derp i see the big h said exactly the same thing.

though if its a terrain piece that ends up connecting to other pieces like wall bits then be careful of how much you sand stuff down. if its a standalone it wont matter.

 Desubot wrote:
If you are worried about it not sitting flat you could always sand it down.

take a super flat surface like glass or a polished stone tile, tape a sheet of sand paper and do figure eights on it with the base.

if its anything like i think it is then its going to be a bit concave so only the edges will get sanded so you dont have to go that far.

Edit: derp i see the big h said exactly the same thing.

though if its a terrain piece that ends up connecting to other pieces like wall bits then be careful of how much you sand stuff down. if its a standalone it wont matter.

Great minds think alike Desubot !

I have some resin walls from MicroArts studios in Poland.

The resin is VERY smooth and even an etch primer would bead on the surface. I had to cut the shine back with a sanding sponge just to get the primer to stick properly and give a good surface. After that, painting was a doddle.

I've got other resins from Pig Iron that primed fine.
Same with stuff from Antenocitis workshop.

Some resins just give that issue.