Tip of the month Help my acrylic doesn’t harden? The cold winter weather can cause that your acrylic doesn’t harden well enough or too slowly. Please keep into consideration the temperature of the liquid, the hands of the client and yours and that of the working environment. Keep the acrylic in a safe place at room temperature to prevent delayed hardening. When the clients hands are too cold you can use the Electric Mittens (thermo gloves) to warm them. This way we can influence the hardening process positively. Important! The acrylic must absolutely never freeze. The product won’t work anymore and can never be used again!