Apple is set to launch a screen replacement program for the aluminum versions of Apple Watch Series 2 and Series 3. It will prevent a crack along the rounded edge of screen. The affected models are both 38mm and 42mm of Series 2 and 3 with GPS-only and GPS-cellular versions. Nike+ versions of both models are also part of this program. You have to find Apple Authorized Service Provider or go to an Apple Retail Store.