# What investment powder to used for purple resin? **URL:** \ **Category:** Form 2\ **Created:** [October 25, 2018, 9:03am UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931 "2018-10-25T09:03:41Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![faller](https://avatars.discourse-cdn.com/v4/letter/f/85f322/32.png) [@faller](https://forum.formlabs.com/u/faller)\ **Post date:** [October 25, 2018, 9:03am UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/1 "2018-10-25T09:03:41Z")
**I NEED HELP** hi we have just starting using the purple wax and Ive done a few trials in casting straight to silver with unsuccessful cast, each time the models come out with a very rough, porous, textured surface. Ive tried several different changes such as \*using pro cad \*leaving longer to air dry at room temperature \*putting flask into preheated oven \*change the oven burn out \*making sure the resins are well spaced in the tree and upright - using fresh investment powder i really don’t know now what else to try??? any ideas?? I’m currently using omega+ goldstar has anyone used this and received successful casts in either silver or gold or what other investment powders would you suggest using ---
**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:** [October 25, 2018, 3:15pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/2 "2018-10-25T15:15:44Z")
Hey there @faller, Thanks so much for your post. Sorry to hear your casting hasn’t come out super clean at this point. Do you mind if I ask whether the print itself is smooth straight out of the printer? Or are you seeing a porous bumpy surface on the print as well as the final casted product? ---
**Author:** ![antsaldana](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@antsaldana](https://forum.formlabs.com/u/antsaldana)\ **Post date:** [October 25, 2018, 9:51pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/3 "2018-10-25T21:51:03Z")
I have been dealing with this same problem since the purple resin came out, i bought it the first day it was released. on another forum i saw a burnout that changed everything. i have had five flawless casts since i started using it. i am using R&R plasticast and just mix as per the instructions and use this burnout. Rates are per hour. I would love to see your results ![IMG_5440](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/a/a2bc063a3ccdeb7f38f67bfc1fb159f0ad7bc877.jpg) ![IMG_5439%20(2)](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/b/baad096659e5f92317335b7f7ead68d6e428f520.jpg) ---
**Author:** ![antsaldana](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@antsaldana](https://forum.formlabs.com/u/antsaldana)\ **Post date:** [October 25, 2018, 9:53pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/4 "2018-10-25T21:53:49Z")
BTW, this burnout was used for prestige optima, but works great with plasticast. I also coat the models with lamp oil before investing ---
**Author:** ![faller](https://avatars.discourse-cdn.com/v4/letter/f/85f322/32.png) [@faller](https://forum.formlabs.com/u/faller)\ **Post date:** [October 26, 2018, 10:14am UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/5 "2018-10-26T10:14:18Z")
> [@antsaldana](#): > > plasticast hi DKirch Thanks for your reply, no the prints have been fine (apart for one mishap so far which i sorted after cleaning out the tank) The bumpy rough surface is only happening at the cast stage. i believe now its the burnout programme I’m using and I’m in the process of of doing a few tests runs which i hope will be successful ---
**Author:** ![faller](https://avatars.discourse-cdn.com/v4/letter/f/85f322/32.png) [@faller](https://forum.formlabs.com/u/faller)\ **Post date:** [October 26, 2018, 10:29am UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/6 "2018-10-26T10:29:27Z")
hi antsaldana Thanks for your reply and information, i am in the process of testing using different burnout programmes which i believe is possibly the problem. i was originally using one form labs suggested and twerking it a bit but now believe i should follow more closely with the burnout goldstar suggest (i’m using goldstar omega+ investment powder) Lamp oil? this is a new one, i’ve never heard that, does it help? i’ve have a flask ready to put in the oven tonight and used pro cad to coat a few to see the difference. Ill let you know if the burnout work out any better than the previous few 🤞 ![IMG_0065](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/5/514b371309355ae4e929df58f271fd9eb0ab195e.jpg) this is a sample of previous attempts 😠 1. List item ---
**Author:** ![antsaldana](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@antsaldana](https://forum.formlabs.com/u/antsaldana)\ **Post date:** [October 26, 2018, 9:05pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/7 "2018-10-26T21:05:09Z")
The lamp oil definitely helps, its just something i learned early on casting resin models. i think the key to the burnout is having a longer drying time at or under 300 F. Every burnout i tried with any soak time between 300 and top casting temp was a complete failure. we had another perfect casting this morning with that burnout. hope this helps ---
**Author:** ![opalboy42](https://avatars.discourse-cdn.com/v4/letter/o/c89c15/32.png) [@opalboy42](https://forum.formlabs.com/u/opalboy42)\ **Post date:** [October 27, 2018, 3:04pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/8 "2018-10-27T15:04:28Z")
I’m having the same casting results as faller, I will try the new burnout schedule, and I also bought a surfactant, we’ll see how that works. I also bought platicast with bandust, previously using just plasticast. Good luck! ---
**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:** [November 3, 2018, 3:04pm UTC](https://forum.formlabs.com/t/what-investment-powder-to-used-for-purple-resin/20931/9 "2018-11-03T15:04:34Z")
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