Only if the aircraft is released to service.
In the cases I was thinking of the aircraft remained on the ground while replacement windscreens were ordered. Something like a 172 is a mongrel to get right. Breaking a new screen is a waste all the same.
Most hangars are more than happy for the owner to be involved for that reason.
I have seen pics taken by owners where the job looks good, great even but then you see metal scrapers and the acidic sealant in the background. Not the end of the world obviously but just a shame that a few basic steps have been missed.
Some of the owners have been good though and managed to get a log entry organised.
The corrosion issues are not really a concern and are probably a little academic anyway.
The signature should still be for the job being done, and to an acceptable standard at that.
It is the guys that don't manage the log entry that are the problem all the same.
I can live with a bad job on someone-else's aeroplane, just as long as he takes responsibility for it. As others have mentioned here, - it should not be something that will bring the aircraft down anyway.
All the owner has to do is a log entry.