I’ve been working on a small project to increase my modeling and building skills, and I’ve come across an issue with meshes. While I was working on an hourglass, I tried modeling the glass part of it and post-upload to studio, I noticed that whenever I tried to change the transparency of the mesh, it would become immediately transparent past 0.

Is this purposeful or am I doing something wrong? I haven’t been able to find anyone else talking discussing this, though my research was rather surface level.
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I think I figured out the problem.
It seems to be the problem with the texture you’re using on the MeshPart.
I took a random Mesh I found in the tool box, and found that I could edit its transparency without issue.
However once I used the same texture that you used, I experience the same issue that you had.
I don’t know why this happens, but changing the texture should fix this.
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Here’s a gif for “reference” of what I did. Sorry for the bad quality.

You’re right, I just had to delete the texture, I can’t believe I didn’t realize this. 
Thanks, hopefully someone finds this thread of use in the future.
Ok here’s a solution for anyone stumbling upon this, that actually needs the texture on their mesh. All you need to do is copy the texture ID, add a SurfaceAppearance object into the mesh, set its AlphaMode to TintMask and then just paste in the texuture ID. This allows you to make the mesh transparent without issue.
Edit - You gotta paste the ID where it says “ColorMap”