Powertex Universal Medium can be used on almost any surface and for a range of art or craft projects. It’s unlike many other art supplies so I’m answering some of the questions that come up about using Powertex.

Can I use Powertex on plastic and other questions

Here are some of the questions I’ve come across as a Powertex artist and tutor, about using Powertex.

When I say “Powertex” I mean Powertex Universal Medium.

Powertex art and craft supplies, using Powertex on plastic and other questions

Can I use any fabrics with Powertex?

The quick answer is yes but not all fabrics will behave the same! Natural fibres work the best with Powertex if you’re looking to create a solid sculpture or texture. The more synthetic fibres in the mix, the less the fabric will harden. Aim for at least 70% nature fibres for the best results. Synthetic fabrics will remain softer and more flexible even when cured. They will also be less weather resistant so keep that in mind if you’re creating something for outside.

If you’re using Transparent Powertex with fabric it’s worth doing a test piece first as it might darken the colour of your fabric.

What other materials can I use with Powertex?

Stick to natural materials to get the best from your Powertex as a fabric hardener, adhesive and paint. Fabrics and textiles such as muslin, cotton t-shirt or sheeting, hessian, stockinette and denim can all be used with unique textures.

Try adding wood, mdf, chipboard, cork, metal, aluminium wire, string or threads, t-shirt yarn, cotton yarn, silk flowers, feathers, raffia, heavy card or paper, paper clay, glass, sand or stone (and there’s more I haven’t thought of)!

You can also use acrylic paint and inks and decoupage with thin papers on Powertex surfaces.

Powertex art doll using mixed media by Kore Sage

Can I use Powertex on plastic?

Powertex does not stick permanently to plastic. Soft plastics can be particularly unstable. If I pour my Powertex onto a plastic plate and leave the leftovers to dry, the Powertex appears to stick to the plate. I can turn it upside down even. However it starts to peel away if I bend the plate or with minimal help from a palette knife. If you want your project to last, to go outside or certainly if it’s for sale I recommend you prepare your plastic surface first or use something else. 

How do I prepare plastic surfaces for Powertex?

Plastic shapes such as flower pots, bottles or boxes can be covered with masking tape which provides a surface suitable for Powertex. On intricate items masking tape may be too fiddly. Spray primers for plastic are available for these type of projects if you need your work to be lasting. I’ve heard of others using Gesso to prime plastic surfaces with success.

I’ve heard hairspray also suggested. I haven’t tried this but perhaps it gives the surface a “tooth”. However, the silicone content of the hairspray might not be the best base for your Powertex if you want a project to last. For short term projects this will work well enough.

Will Powertex stick to glass?

Yes it will. If painted on the Powertex may bead but a repeat application will usually help with this. Light weight fabric such as muslin makes a good first layer if you’re using fabric. Masking tape can be used if it can be hidden and is useful for bottles and wine glasses. If you’re using a fabric wrapping technique be sure your fabric is not over saturated with Powertex, your fabric should be tacky, not dripping!

Powertex Bottle and Goblet with skulls and roses

I’ve heard Powertex is weatherproof not waterproof

Powertex Universal Medium is weatherproof and water resistant when cured (after 3 weeks). Cured Powertex can resist bad weather including rain but it should not be submerged in water. It is not waterproof.

Projects for outside should be made with Powertex Universal Medium and natural fibres or coated fully with Easy Varnish which is also weatherproof. (Easy Varnish is used to protect any colour you add on top of the Powertex.)

If I decorate glasses can I wash them?

Projects like glasses can be washed with warm soapy water, rinsed and left to dry but should not be submerged in water or put in the dishwasher. Warm water may cause the Powertex to soften but will harden again when cool.

Fairy houses by Kore Sage

Are Powertex products safe for use with candles?

I strongly recommend that battery LED candles or lights are used with Powertex projects. LED candles are available in a wide range of styles, colours and sizes and are a safer alternative. Your fabrics and materials remain flammable despite the Powertex.

Mixed media canvas by Kore Sage

Got more Powertex questions?

Powertex products are very versatile and Powertex artists and crafters are creating extraordinary things all the time.

Updated June 2021

It’s harder to get to a Powertex workshop at the moment but I have a Powertex Facebook group to share tips, articles and project ideas. It’s a great place to ask your Powertex questions and help others with their Powertex projects. Join in here. Not on Facebook? Sign up to my newsletter instead to keep in touch.

Pinterest pin Can I use Powertex on plastic and other questions



8 Comments

Debbie · 20th January 2019 at 9:38 pm

Thank you. That was so helpful. I have only just started using powertex so found that very useful.

    Kore · 21st January 2019 at 10:54 am

    I’m so happy you found it useful Debbie. Thanks for taking the time to let me know too!

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