<p>I've got a bottle of UV resin that got left at the back of  draw and forgotten about. It's probably 6 months out of its advertized use by date.</p>
<p>What is likely to happen if I try to print with it?</p>
<p>It's Elegoo standard Black.</p>

CC BY-SA 4.0
2022-04-24T14:14:09.340Z
Quick answer without research: it may start to self-cure, causing viscosity changes and clumping.  If it is hygroscopic, it may also absorb humidity which can cause it to fail to cure, but a well sealed container should prevent that.  It may be possible to use by filtering for particulates and diluting with fresh resin, but print quality could suffer.
user10489
CC BY-SA 4.0
2022-04-25T18:17:38.853Z
Try it and find out? Don't use it for anything critical. Expect to have to reprint, be happy if you don't have to.
FreeMan
<print-material><resin>
What happens if you try to print with UV resin that's well past it's use by date?
Aaargh Zombies
# What happens if you try to print with UV resin that's well past it's use by date?

(Asked by: username_0 on 2022-04-22)

I've got a bottle of UV resin that got left at the back of draw and forgotten about. It's probably 6 months out of its advertized use by date.

What is likely to happen if I try to print with it?

It's Elegoo standard Black.

**Tags:** print-material, resin
> **Comments:**
> **username_1**: Quick answer without research: it may start to self-cure, causing viscosity changes and clumping.  If it is hygroscopic, it may also absorb humidity which can cause it to fail to cure, but a well sealed container should prevent that.  It may be possible to use by filtering for particulates and diluting with fresh resin, but print quality could suffer.  
> **username_2**: Try it and find out? Don't use it for anything critical. Expect to have to reprint, be happy if you don't have to.  

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