I’ve recently started using the Paint tool in UE4 and I’m experiencing some weird glitch. After I paint something on my mesh and move a little further from it one of my materials completely dissapears like on the screenshots below:
I had this problem myself and found out that the fix can also be that your texture is set to have mipmaps. To do this open your texture settings in Unreal and then change MipGen setting to NoMipmaps.