Plastic Molding to create resin items

Plastic molding most often refers to using various plastic molds to create resin items. With molds you can create your own resin jewelry, wall plaques or clocks, drawer handles, sun catchers, souvenirs, soaps, and even chocolates or cheese. NOTE: it is imperative to use prominently marked FDA approved “food-safe” plastic molds when making food items. Using different combinations of resins, dyes, and artifacts to embed, you’ll be able to create beautiful resin items and jewelry limited only by your imagination and skill.There are a multitude of plastic molds that you can buy ready-made, or you can make your own mold using silicone or latex rubber. The actual molds used for plastic molding can be as simple and elegant, or as detailed and eye-catching as you imagine them to be. You can also embed charms or other unique artifacts in the resin in the plastic mold of your choice to make one-of-a-kind jewelry sets to match that special outfit or to surprise that special friend in your life.These durable reusable molds come in self-releasing polypropylene and polyethylene plastic molding, used with clear polyester resin or an epoxy resin like Resin Obsession Super Clear resin.  Although considered self-releasing due to their flexibility, the use of a mold release/conditioner when casting resin is highly recommended to clean, condition, and extend the life of your molds. Odorless and solvent-free, Castin’ Craft Mold Release Conditioner is most often suggested by many experienced resin crafters. A more advanced type of mold release is the Ultra 4 parafilm mold release.

It is simple to make your own jewelry with plastic molding and resin. It is, of course, always a good idea to protect your work area with freezer paper, waxed paper or trash bag. By first removing any dust or accumulated dirt from the mold, then simply spraying the mold with mold release, you’ll be ready to begin. After placing the treated mold on a level surface, fill the mold cavities to just below the top. Once the pieces are cured, simply flip the plastic molding tray over, and press the center of each piece to release it, flexing the mold if necessary.

Depending on the type of resin used, it is recommended to warm the silicone molding trays before using them. Since many plastic resins are heat-producing, heating the mold just prior to filling it can reduce the curing time—a major consideration if you are making a quantity of serial casts in one session.

Depending on the items you wish to make, there are many ready-made plastic molds available for you to use at Resin Obsession.

 

Unpublished Blog Posts of Resin Obsession, LLC © 2012 Resin Obsession, LLC

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29 Comments

Amol

we use similar maratiel where i work. we are having issues with bubbles forming on the surface. we are trying to coat basically a board. bubbles get trapped against the face on the bottom side of the mold. were testing a vibrator currently but any replied ideas would be greatly appreciated

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Tyler

I use a blow dryer to heat it up and the bubble come out. Same way we do floors but we use a propane torch for those.

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Katherine

Amol,

I have moved your question to our forum section for others to comment.

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Lisa

I want to transfer a picture from transparency paper onto the resin. I made one by mistake but it was torn apart in the process. Any ideas? Also I made 2 coasters and used the mold release and they are still hard to get out. I am using the hard plastic molds. I put them in the freezer popped them lightly with a mallet and they cracked! UGH!!

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Katherine

Lisa,

Is the picture already onto the the transparency? Transparencies work great in resin. Just cut out the desired area (with the picture of course) and add to resin.

I’m sorry to hear your coaster molds didn’t work out. Are they like the reusable plastic molds we sell? If so, then I would say you didn’t use enough mold release. Generally, they are flexible enough that with a little mold release, they should pop out fine.

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Fritha

Hi Katherine. I am making a large resin mould by casting it over glass rocks. It is to be in a large tray approximately 600 long x 400 wide x 20 deep. I want the edges to have a shiny finish. What material do you recommend for the edges? I was recommeneded melteca but it is quite expensive. If I coated MDF or custom wood with plastic do you think that would work?

Thanks very much
Fritha

Reply
Katherine Swift

Fritha,

Have you tried a smooth polished acrylic? I would try to mold a sheet of that. It imparts a nice shiny finish to the silicone.

Reply
Kathy

I am new at resin jewelry making. I attempted making my first pieces and the plastic stickers that was placed inside of the resin mold got lost inside of the glitter that I placed inside of the mold where you can’t even see them.
I used pod modge on the stickers before placing in resin, but I didn’t allow it to dry first. Could that have been the problem?
Also my pieces that I placed inside kept floating around, and ultimately floated to a random spot inside of resin. HELP!!!

Reply
Katherine Swift

Kathy,

I would suggest doing your resin castings in layers. Pour your resin in first, then place your stickers in with a toothpick. Move them around as necessary. Wait until the resin starts to cure (approximately 45 to 60 minutes or so), then add your glitter layer. This will keep your glitter from mixing into your resin and obstructing the view of the sticker. You can see how I do it here in a video on our you tube channel: http://www.youtube.com/watch?v=jSD6gKvn4XE

Reply
Mark

Fritha,
To acquire smooth shiney edges, just polish with a buffing wheel. I buff all of my casts and finished items. Looks like glass.
Using plastics can cause problems. Most plastics will melt so be sure to use PP. The comercial molds are made from it.

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Harry

Hi Katherine,
First of all please accept my heartiest Thanks on such a wonderful and helpful website.
Now can you please provide a detailed information on how I can make my own molds for making resin gems in good quantity. I want to make at least one mold of 50 to 100 pieces of each size and shape per mold.
I need to make at least a 50 molds like that.

Reply
Katherine

@Harry,

I’m going to move your question to your resin jewelry forum under “How Can I…?”

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Chuck

I watched one of your videos on youtube where you made a beer bottlecap coaster. My question is how did you make the base Yellow? do you have the video where you actually made it?

Any and all help is greatly appreciated. Thanks

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Loretta

How do you get your silicone putty molds to produce a shiny finished piece ? I have made putty molds from both shiny surface pieces and matte finish pieces but when coasted both come out matte finish and not shiny . I’ve read where you can mix diamond glaze with your resin pour . Is that the solution ?

Reply
Katherine

@Loretta, sometimes the putty can trap gas that can affect the surface of the casting. If the mold putty you used is oven safe, I would suggest baking your finished mold for 30 minutes at a temperature suitable for the putty. (Look on the box or check with the manufacturer.) You should then be able to get shiny castings from your molds made from shiny models.

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Maggie

I just finished casting resin charms. Before removing the pieces I saw that the finish was mirror shiny – beautiful. But when I removed the pieces from the molds, the “right side” was not shiny, rather dull, not the intense watery appearance as on the backs. What went wrong? and how can I fix these charms and all the next charms? Thank you.

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Nathan

Hi Katherine! Great post! Question – what should I used as my mold cast for a larger project. Say a 3′ x 8′ table that I want to cast in. Its an irregular shape so Id like some of the table edges etc to just be the clear class essentially if that makes sense. I was thinking build my own frame, then use whatever you think would be best to cover frame snuggly (wax paper or trash bag or plastic tarp ((This is where I need help)), then place irregular object down into frame and then us resin or epoxy to fill in. Thoughts? Thanks in advance

Reply
Rick

Hello,
I am making a bedside table. Half concrete, Half Resin. How is best to make the mold for this?? Will the resin stick to the concrete?

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tony

want to duplicate a small part. want to try resin in a plastic or metal pipe. will center drill the casting and chop into 1 inch pieces. looks not important. durability a must. never done any of this before. looking for options to make part i need. suggestions? thanks

Reply
Katherine Swift

I’m not clear on what you want to do. What are you trying to duplicate?

Reply

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