However there was once I bought a new stereo for home use.
It came with "mirror" LCD display.
It is not with me now but it looks like this:
I thought it would be nice to apply some wax and protect it.
I applied a thin layer of NXT 2.0 liquid.
However as I spread it on I found that the silver layer was gone!
So I guess not all plastic are suitable for waxing / sealing.