deleted

 

The valve cover looks decent, that heat shield looks ghetto fabulous. Cheap mod for sure.

 

If the this tape is sticky on one side i would go to Home depot and buy a piece of aluminum and cut it as close as you can to the shape needed then wrap it in that tape. At least that way it wont look as ghetto.
As for the valve cover i would put little more effort in sanding it down and smoothing the surface then priming it and coating with high heat paint. Looks like you have a lot of cracking/waving going on there.
Looks good tho

 

Listen, the heat shield Idea is Great by you are dealing with Infrared Heat. I don't see the back too well but from what I see is there is nothing back there. What you have there is a good Heat Conductor. Need to have Fiber Glass or some kind of insulation behind it or you will transfer the Heat from one side to the other side. The buffer is a must.

I do similar testing where I work and over the years I have learned alot on Shields, heatsinks and so on.

 

That Electrical Tape is bad idea. Use High Temperature Wire loom.

 

and you think that looks good...?

 

In My line of Work, Electrical Tape is Evil. Good for temporary Fix.

 

deleted

 

good point, it is a good idea maybe take like 5 min i bet you can make it look good, it sure stops the heat soak

 

On my Bmw's Valve Cover I used high temperature Shrink Paint. That made the Valve Cover look sweet. I am thinking of doing the same with the Audi.