RenderTexture to sprite issue

Hi!
I want to take snapshot of 3D object and put it in UI. In general im able to do this with camera.Render but have some problems with final sprite. I use some custom shader to outline 3D object, it looks like this:


in RenderTexture it looks:

with settings:

But in final UI image it becomes this:

Outline is just very thin line, but i wish it to be like on RT. Have tried a lot of different ways, but no success. What im missing?