I agree with Daniel - Remove the mylar before touching up - However - Removing mylar may make things worse in other areas of the playfield. If you accidentally lift paint in another area, just so you can fix that small area you have touched up - then you have gone backwards !
Then again, if the mylar is thin - then it is NOT mylar - it will be "contact" adhesive. In my experience - this stuff comes off EASY.
However - Mylar removal is totally your decision.
The "5 minute fix" is to work out how to replicate the number "5", then paint or use a decal. You will have to place a small piece of mylar over your repair !
