Update on Sylgard 184
 

I tried the method I suggested using two 8" watch glasses. It worked well, except that it's difficult to control the lowering of the watch glass. I would suggest instead that if the CRT can be supported face down, to raise the lens up to it using a lab jack.

I also made a mistake in my message to JB5pro. When I estimated the volume needed I did pi*d**2 instead of pi*r**2 for the area. I was a factor of 4 too high.