top of page

That's Not Uncured Resin, It's Just Mineral Oil

When printing with your WRAP, you may find that there is some residue on the surface of the solid plastic stock. Don’t be alarmed, your print is fully cured. The liquid on the surface of the print is mineral oil, which is a component of the PolyJet support material. It can be easily wiped off with a paper towel or cloth.

Why Mineral Oil?

Stratasys’ PolyJet support material contains mineral oil. It has a yellow tint that can be mistaken for uncured resin. The mineral oil will appear on the surface of WRAP parts which contain larger amounts of support material.

How To Prevent Excess Mineral Oil

Waste resin is a mixture of many different materials, and its composition is determined by a wide variety of factors. When waste resin sits for a period, you will notice mineral oil floating at the surface of your storage container or bucket. If this high content of floating mineral oil is poured into the WRAP’s Vat, it can cause a higher ratio of mineral oil to be present on the surface of your finished WRAP prints. If there is excessive separated mineral oil, it can negatively affect the quality of the print.

To control this and generate the best results, we recommend the following steps:

  1. Pour your resin into a five-gallon bucket

  2. Mix resin with a hand drill using a standard paint mixing bit

  3. Pour the freshly mixed resin into its respective Vat (Low, Medium or High Viscosity) using the provided disposable filler filter

  4. Initiate your WRAP print

This process will help greatly reduce the ratio of mineral oil in your prints and provide the best print consistency. To learn more about machine care and safe resin disposal, check out the Onulis Trash Talk blog posts.


bottom of page