2 discs in drive!?

[moose2k22]

Hi

Just got my ps2 v5 succesfully chipped with a messiah chip from charlie_ps2. Works like a charm, BUT there's one game I cant boot. It sounds like the ps2 can't read the disc, cause it spinning up and down all the time. It's a cd-rom backup. I've burned other games on these cd's (verbatim) which works fine.
Somebody once told me that I could try putting another disc on top of the hard to read disc. Is this a good idea? Can I harm the ps2, the drive, the laser or anything else?