Polystick underlayments from Polyglass can be exposed for 90-180 days, depending on the specific product:
| Underlayment | Max exposure time |
| Polystick® IR-Xe | 90 days |
| Polystick® MTS Plus | 180 days |
| Polystick® MU-X | 90 days |
| Polystick® P | 180 days |
| Polystick® TU MAX | 180 days |
| Polystick® TU P | 180 days |
| Polystick® TU Plus | 180 days |
| Polystick® XFR | 180 days |