[Katherine Swift]

This question comes from Jennifer:

hi there. i read through your helpful tips on how to choose the right resin and of course i’m still not sure. ; ) I would like to try putting cardboard round vintage beer coasters in a round resin mold…they would take on the look of a paper weight, but i would like to use them as coasters. the molds i purchased from resinobsession aren’t the right size but i did find a metal large hamburger tray where they fit perfectly….can i use metal as a mold? thanks for your help i’m so clueless about this. the type of resin you would recommend? i have 85 of these cardboard coasters.

[Katherine Swift]

Hi Jennifer,

Since you are using the resin in a mold, you will need to use a casting resin. These resins are designed for use in molds. They mix in a thin viscosity, so bubbles are almost never a problem. You can learn more about casting resins in our resin buying guide: https://www.resinobsession.com/resin-frequently-asked-questions/resin-buying-guide/

For pours of 3 ounces or less, the Resin Obsession super clear resin is what you want to use: https://shop.resinobsession.com/collections/resin/resin-obsession-super-clear-resin

For pours of 3 ounces or more, you want to use the Resin Obsession deep pour resin: https://shop.resinobsession.com/collections/resin/resin-obsession-deep-pour-resin

As for the mold, using a metal mold for resin is going to be trickier. Part of the reason for using plastic and silicone for resin molds is that they are flexible and will release the resin. Not only is a metal mold not flexible, but resin likes to stick to metal. If you wanted to try, I would be absolutely sure to use a mold release. This is the one I would recommend. https://shop.resinobsession.com/collections/tools-and-supplies/products/petrolease-non-silicone-food-grade-mold-release

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