# Flexible surface viscosity

**URL:** <https://forum.formlabs.com/t/flexible-surface-viscosity/31093>\
**Category:** Materials\
**Created:** [May 18, 2021, 1:43am UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093 "2021-05-18T01:43:23Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![leonlin](https://avatars.discourse-cdn.com/v4/letter/l/e0b2c6/32.png) [@leonlin](https://forum.formlabs.com/u/leonlin)\
**Post date:** [May 18, 2021, 1:43am UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/1 "2021-05-18T01:43:24Z")

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hi friend  
My flexible 80A model surface still had viscosity after cleaning and curing . It feels like tape . Do you have this situation and the solution? THX

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**Author:** ![Randy\_Cohen](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/randy_cohen/32/1500_2.png) [@Randy\_Cohen](https://forum.formlabs.com/u/Randy_Cohen)\
**Post date:** [May 18, 2021, 3:14am UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/2 "2021-05-18T03:14:32Z")

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How did you cure it?

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**Author:** ![leonlin](https://avatars.discourse-cdn.com/v4/letter/l/e0b2c6/32.png) [@leonlin](https://forum.formlabs.com/u/leonlin)\
**Post date:** [May 24, 2021, 12:22pm UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/3 "2021-05-24T12:22:27Z")

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Hi Randy  
Because it make touch effect . flexible 80A surface is still a little sticky After cleaning .

I want to know if there is some solution？ THX

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**Author:** ![DKirch](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/dkirch/32/20300_2.png) [@DKirch](https://forum.formlabs.com/u/DKirch)\
**Post date:** [May 24, 2021, 12:26pm UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/4 "2021-05-24T12:26:06Z")

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Hello @leonlin!

I think what Randy’s asking is can you tell us specifically what you did to wash and cure these particular parts? How long in the wash, how clean was your IPA, etc.

Once we have that info we might be able to offer some more specific advice! 🙂

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**Author:** ![Randy\_Cohen](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/randy_cohen/32/1500_2.png) [@Randy\_Cohen](https://forum.formlabs.com/u/Randy_Cohen)\
**Post date:** [May 24, 2021, 8:31pm UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/5 "2021-05-24T20:31:34Z")

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I think the flexible resin might need to be post-cured under water. The stickiness on the surface won’t go away until the resin on the surface is fully cured, and it doesn’t cure if it’s exposed to Oxygen. I’m too lazy to go read the Flexible 80 use instructions to confirm. But a few years ago with an earlier version of Formlabs Flexible, this was the required method - under water. I built a UV curing “jar” out of a clear plastic container with UV LEDs wrapped around the outside facing in, so I could cure Flexible by filling the jar with water or cure other resins “dry”.

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**Author:** ![leonlin](https://avatars.discourse-cdn.com/v4/letter/l/e0b2c6/32.png) [@leonlin](https://forum.formlabs.com/u/leonlin)\
**Post date:** [May 25, 2021, 2:09am UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/6 "2021-05-25T02:09:18Z")

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Oh, I misunderstood what Randy’s meant.I washed it with 95% alcohol for about 15 minutes instead IPA。😥

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**Author:** ![leonlin](https://avatars.discourse-cdn.com/v4/letter/l/e0b2c6/32.png) [@leonlin](https://forum.formlabs.com/u/leonlin)\
**Post date:** [May 25, 2021, 2:13am UTC](https://forum.formlabs.com/t/flexible-surface-viscosity/31093/7 "2021-05-25T02:13:01Z")

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oh ,THX. I will try to deal with it. 🤝