This will require determining the correct difference between the temperature of the insert and the temperature of the mould. Epoxies and Polyurethanes shrink during cure. Surface defects and a weakened structure will result if the shrinking material is not able to replenish from a reservoir of cooler material. Does polyurethane smell bad? is polyurethane smell toxic.

Does polyurethane shrink with heat?

This will require determining the correct difference between the temperature of the insert and the temperature of the mould. Epoxies and Polyurethanes shrink during cure. Surface defects and a weakened structure will result if the shrinking material is not able to replenish from a reservoir of cooler material.

Does poly shrink in dryer?

Both 100% polyester and polyester blends can shrink in a dryer. Even if the garment has been washed by hand. Choosing a hotter setting on your dryer than you would normally cause a range of shrink levels from moderate to maximum.