Moldable Plastic FAQ

Can you color the plastic?

There are two ways to color the plastic: mix color into the plastic while you are molding it or paint it after it cools. 

Add our Polly Plastics Color Pellets to the hot water along with the clear pellets.  Once the moldable pellets are clear, remove and knead together with your hands.  The color pellets will blend in and color the plastic throughout.  You can also add color alcohol ink or paint powder to the molten plastic as you work it.  Inks and powders are available at crafts stores like Michaels or Hobby Lobby.  Food coloring does not work very well to color the moldable plastic.

To paint it, you can use an acrylic paint found in hobby stores. For large, single color pieces, you can use special spray paints for plastic like Krylon Fusion paint. If you experience any flaking of the acrylic paint, you can coat it with polyurethane after painting. Or you can first coat it with a Fusion undercoat and paint over it.  You can also color the surface with Sharpie markers.

Can you pour this into a mold?

It is not liquid enough to pour into a mold but you can press the molten plastic into a mold.  You can make your own molds using our Polly Plastics Silicone Molding Putty or buy molds from your local craft store.  Coat them lightly with vegetable spray before molding, so it will be easy to remove your part from the mold.

Can you attach the moldable plastic to other objects?

It sticks wells to itself so you can build up a part to make it bigger or add extensions to a part you already made.  Just heat the part with hot water or a hair dryer so it becomes sticky.  It also sticks to some other plastics like ABS (Legos), acrylic, polycarbonate, polyester, PVC (tubing) and vinyl.  It won't attach to wood or plastics like nylon, polypropylene, silicone or Teflon.  For those instances, you can use Super Glue or epoxy.  Or drill into the part and attach with screws.

Will this melt again once it cools?

If you are not happy with your part, you can re-melt and re-mold repeatedly.  Also, it may soften in very high temperatures so avoid areas like the inside of your car on a very hot day.

How much does each package make?

The 35 oz. size makes a 4 inch cube if all melted and pressed into a block.  The 22 oz. jar make a 3.25 inch cube, the 16 oz. jar makes a 3 inch cube and the 10 oz. jar makes a 2.5 inch cube.

Is it food safe?

Our moldable plastic is non-toxic for handling but is not FDA approved for food contact.

How long does the product stay moldable?

Once the pellets are clear and you remove them from the hot water, you have several minutes to shape the plastic before it becomes stiff.  You can dip it back into the hot water to shape it more or you can heat it with a heat gun or hair dryer to soften it in certain areas.

The plastic will harden in about 10 minutes, depending on part size.  You can speed up the process by dipping it into cold water.

How strong is the finished part?

The finished part will be as strong as typical plastics.  You can sand it, drill it and machine it like plastic.

Do you have one that stays clear?

No, unfortunately we do not and do not know of any that does.

How do you heat the sheets?

Most people use a heat gun but you can use hot water or a microwave.

Can the sheets be attached to each other to make a larger piece?

Yes, they can be fused together at the edges.  You will have to decide whether the seam is acceptable to you.

Do the sheets and strips come in different sizes or colors?

No, we only carry the sizes shown on the website product pages.

How do you cut the sheets and strips?

You can use scissors but generally some type of shears or box cutter works best.

What kind of plastic is this?

A polyester called polycaprolactone.

Are you colors compatible with other brands?

Yes, they will work with other moldable plastic brands.

Do you sell larger quantities of moldable pellets and sheets?

Yes, check out our bulk pricing here.