Not sure if anyone mention this before, but my translite had some small damages and you could see the back board light shining through it.
I managed to “fix” this by putting painters tape on the backside that I have made black on both the sticky and non sticky side of it..
I left the painters tape on for 3ish months and checked if it came off without causing more damage. That was the case. So I put the tape back on as a permanent “fix”.