# Porosity in castings **URL:** \ **Category:** Support & Troubleshooting\ **Created:** [June 6, 2016, 11:50am UTC](https://forum.formlabs.com/t/porosity-in-castings/8471 "2016-06-06T11:50:52Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Charles\_McManus](https://avatars.discourse-cdn.com/v4/letter/c/b5e925/32.png) [@Charles\_McManus](https://forum.formlabs.com/u/Charles_McManus)\ **Post date:** [June 6, 2016, 11:50am UTC](https://forum.formlabs.com/t/porosity-in-castings/8471/1 "2016-06-06T11:50:52Z")
Continuing the discussion from [Curing and Casting castable resin](http://forum.formlabs.com/t/curing-and-casting-castable-resin/6742): I’ve also been having real issues with porosity in my castings. I’ve been using Omega+ investment powder (plasticast isn’t available in the UK), which is giving me nice wax castings, but swiss cheese formlabs castings. Thanks to @Malissa_Kuznicki for the link to the white paper - definite food for thought. From that, and other suggestions, I’m going to try - curing with a 405nm uv nail lamp (36w) for 24 hours - changing my investment mix from 40:100 to 38:100 - raising the flask onto a wire rack to aid air flow (My burnout oven has 2 vent holes on top, and no forced ventilation). - turning the flask over 2 hours before casting Has anyone had any joy with any of these techniques? I don’t really want to get into spraying the prints with lacquer - if the resin needs this extra hack to cast properly, then I’d say it isn’t doing its job. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\ **Post date:** [June 20, 2016, 11:50am UTC](https://forum.formlabs.com/t/porosity-in-castings/8471/2 "2016-06-20T11:50:51Z")
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