Worbla Crystal Art (WCA) Thermoplastic Modelling & Moulding Pearls. Worbla Crystal Art (WCA) are versatile thermoplastic modelling and moulding pearls from the Worbla’s Art Series. WCA is activated by a hot heat at approximately 110°C (230°F) and hardens after about 10 minutes but can be reactivated at any time. It is recommended that heat protection gloves be worn when working with WCA. It is ideal for use with moulds or free-form modelling for crafting mixed media arts, costumes and props. It can also be used for smoothing and filling edges and gaps in creations made with the Worbla’s Transpa Art. - Can be reactivated with heat as often as required at approximately 110°C (230°F) - It is recommended that heat protection gloves be worn when working with WCA - Can be dyed directly with glass paints or painted afterwards - Works perfectly [read more].. Condition:: New: A brand-new, unused, unopened and undamaged item. See the seller's listing for full details. See all condition definitions : Brand: : Cast4Art , MPN: : Does not apply , 。