Plastic Moulding

Plastic moulding is the various plastic molds in which resin is poured to make resin castings. Molds are readily available in a wide variety of forms that allow you to create unique resin jewelry, souvenirs, drawer handles, wall plaques or clocks, sun catchers, soaps, and even chocolates or cheese. It is vitally important to use only “food-safe” plastic molds specially manufactured for use as food molds. You will be able to fashion a dazzling array of beautiful resin items and jewelry using different combinations of resins, dyes, and artifacts to embed: your only limits are your imagination, available time, and skill.

A vast number of ready-made plastic molds are available for purchase, or you can craft and make your own silicone molds. The actual mold trays used for plastic molding can be simple and stylish, or as strikingly detailed as you can imagine them to be. Embedding charms or other unique artifacts in the resin in the plastic mold of your choice will produce one-of-a-kind jewelry which will capture everyone’s attention.

Plastic molding is durable and reusable; they come in self-releasing polypropylene and polyethylene plastic molding, used especially with clear polyester resin or epoxy resin like Resin Obsession Super Clear resin.  While plastic molds are usually self-releasing, using a mold release/conditioner each time a mold is used is highly recommended. It cleans, conditions, and extends the life of your molds through many castings. Castin’ Craft Mold release Conditioner is odorless and solvent-free, and is also one of the most frequently recommended release/conditioners on the market. A more advanced type of Mold release is the Ultra 4 Mold Release. It is as easy as 1-2-3 to make your own jewelry with plastic molding and resin. Before starting, it is, of course, always a good idea to protect your work area with freezer paper, waxed paper or trash bag. After removing any dust, accumulated grime, or resin from the mold, simply spray it with mold release/conditioner, allow to dry thoroughly and you are ready to begin casting your resin creation.

Make sure that the mold is on a level surface, and then 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.

 

Unpublished Blog Posts of Resin Obsession, LLC © 2012 Resin Obsession, LLC

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12 Comments

Matthew

Hello,
I was just curious if you can make this mold or recommened anything I can use for my idea:

I want a large flat mold almost like a cookie baking sheet that I can pour layers of resin into mayb an inch at the most deep. Im looking to set paintings inside the resin so that when it cures it becomes embedded in the middle… I have only been able to find glass or wood and even with the mold release this does not work well at all…. Ive heard older style tupperware works well but I cannot find the size or shape I desire… I guess im looking for a mold generally square or rectangle in sizes more the 12′ by 12′ and up to as much as 3ft by ft. let me know if this is possible TY 🙂
-Matthew

Reply
Katherine Swift

Matthew,
One option is to make a silicone mold the size you need. It would require a lot of silicone and would also be a bit expensive to make.
You could try finding a plastic manufacturer that sells a piece of plastic that large. You can try molding it yourself by adding the heat from a hair dryer.

Reply
Amanda

I had a ball making my own molds with this two part putty that kneed together. This weekend I am going to attempt the pour kind silicone, so I can get a good idea what it is like. The next project will be a paper weight trophies. I would like to use the top of rosette ribbon (minus streamers) for this. I figure I put the top in a book to get flat, but what do I use on the material to keep from sticking to silicone? Or is this idea challenge with so many corners and dips around the topper? Thanks

Reply
Katherine Swift

@Amanda,

Wow, good question! I’m going to move this over to our resin forum under “How Can I”

Reply
Pamela

I make a three dimensional painting by layering resin on plexiglass. Just spread it out to desired thickness on plexiglass, put on what you want, spread another layer, repeat. I don’t remove the plexiglass!

Reply
Mase

I’ve made a 2″ x 3″ shallow bezel cup out of silicone molding material which I poured into a candy tin. (I glued a piece of wood to the bottom interior.) Now I need to make a mold for the resulting “prototype” but I can’t visualize how to do that. Can you tell me how…?

Thanks!
Mase

Reply
Katherine Swift

@Mase,

You will need to treat it like a new object and cast it into silicone. Since it is made of silicone, be sure to use a good mold release, otherwise you will create one big block of silicone.

Reply
Vicky

I would like to make a hollow sphere (large) and don’t know how to pour it 1/2 and cute and when the second half is almost done join them?

Reply
Katherine

@Vicky, you can cast the two halves, then join them after they have cured, or use large mold designed for this purpose to pour it all at once

Reply
Susan

Does anyone know where I can buy the polypropylene or polyethylene (I guess hdpe or ldpe) sheets to use for thermoforming my own molds? I have to make several molds for objects for a school play. Thanks

Reply
Rob

Hi, I do not have any experience but would like to try make resin ball with an insect in it. Do you know how to make my own mold or can I buy it somewhere online?

Reply

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