Why is my resin cloudy? 4 Reasons for Cloudy Resin

why is my resin cloudyIf you are asking yourself, why is my resin cloudy, there are a few reasons why this happens:

Cloudy mold surface

If the mold you used to cast your resin has a cloudy surface, that same cloudy and frosty surface will impart onto your resin surface. This video explains more:

For future casings, inspect the surface of your mold to make sure it has a shiny surface.

Pro tip: just because a mold doesn’t give you a shiny surface doesn’t mean you can’t use it anymore. Simply know that you will need to do some post-curing finishing to get your resin surface shiny again.

Cold resin

When resin gets cold, some of the components can crystallize. These crystals can show up as gray or white streaks in your resin.

Pro tip: Store your resin in a temperature-stable environment. The bottom of a dark closet works excellent for this.

Water contamination

Adding water to your resin will cause streaks. You probably already know this, but did you know that moisture from extra embedments you include in the resin can be the cause of this as well? All items should be properly sealed and dried before adding to resin.

Pro tip: Glue that is damp will leave white streaks. Give it hours to days to thoroughly dry before including in resin.

You incompletely mixed resin and hardener together

It’s not unusual for resin and hardener to show streaks when first mixing the two together. These should go away the more the mixture is combined.

Pro tip: I like to mix my epoxy resin and hardener together for about two to five minutes, depending on the pot time and volume of the resin I’m mixing. Not only does blending for this long remove streaks, but it also makes sure there aren’t any sticky spots after the resin cures.

So, after asking yourself why is my resin cloudy, you may be wondering how you can fix it. Here’s how to fix cloudy resin.

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Like this post? You may be interested in  Top 12 Beginner Questions about Making Resin Jewelry

21 thoughts on “Why is my resin cloudy? 4 Reasons for Cloudy Resin

  1. I had that happen to me. It was a bad batch of gallon resin from the factory. I went back and returned it for a different expiration date sticker and the resin was fine. I dont think that it was due to temperature. Hawaii is pretty warm year round. Lol.

  2. I recently made pendants with sea sand and shells and all of them had varying degrees of cloudiness. I am convinced it is the salt – perhaps one should soak them in fresh water first? Any thoughts on this please?

    1. Hi Janet, it sounds like maybe they weren’t all the way clean first (from salt or otherwise). Washing them in freshwater first should help.

  3. I’ve made a silicone mold of a golf ball. In using clear resin with 7 minute work time, the first pour came out perfect. Later that day I poured a second on that came out frosty. I’m using a gram scale and measuring a 2 oz pour. After making a second mold, again the first was good and second frosty.

  4. No. Tried washing and completely dry and get the same. I can show you a photo of the good and bad, but how do I get that to you?

    1. Hi Jim, I think this situation is best suited for a one-on-one consulting call where you and I talk back and forth about what’s going on. A 15-minute consultation call is $20. I do them by video so I can have a chance to see what you are working on.

      If you are interested, please send a message through the ‘contact us’ page and I can get this going for you. Sincerely, Katherine @ Resin Obsession

  5. What should i do to achieve the “frosty” look. I had it happen once and i loved the effect. It wasn’t the mold and the rest of that resin was perfect.

  6. I accidentally spilled some isopropyl alcohol on my resined painting and it is very sticky? How do I remove the stickiness or do I pour a second coat of resin over it! I thank you in anticipation, Sincerely, Annchen Bodenstab

      1. Hi, I have put jewellery in resin, but it is still a bit cloudy. Do you have any suggestions. Thank you

  7. Are used a mat mold and now my Resin is cloudy looking can I send the first layer off and do a topcoat and bring it back clear

  8. Hi! I had a jewelry piece that I sanded and polished using plastx (car polish). My piece was clear before sanding but now it has an opaque look that I can’t get out. I’m wondering if I should use a different polish, if what’s wrong. I used 220 all the way up to 2000 grit sandpaper.

  9. I am using resin on my glass on wood projects. The wood is old wood rescued from an old porch. Problem : Thirsty wood. Resin almost disappears in areas. Tried pre treating wood, decoupage, acrylic paint, spray varnish.. nothing seems to work and I end up repouring again $$.. any suggestions?

  10. I was filling some silver pendants molds with open back so I placed them on parchment paper and today when I checked them the resin cured cloudy is it because of the parchment? I also
    Poured a small amount into the bottom of a large bookend and that stayed clear so I’m thinking it was the surface I laid these pendants a on

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