Substance Painter Premultiplied Alpha Shader

Custom PBR Metallic/Roughness Shader with Premultiplied Alpha

Have you tried texturing glass in Substance Painter?

By default Substance Painter there has only one semitransparent shader - Alpha Blending. With this shader, with increasing transparency, reflections and speculars also become transparent.

To solve this I suggest using a custom shader with support Premultiplied Alpha. The videos  show how to install and use it.