Bumping old thread...How has it been?
Fed up of the sagging sound proofing under my bonnet, going to get rid later and tape over the holes, but leave maybe 1 or 2 holes alone?
It's still looking good. Maybe slight swell, but not very notable. The water runs out when you drive or open the bonnet. Just open it slow and the water runs out the rear and into the gutter at bottom of the screen.
I would just seal it all up like I did. Don't think it will cause any problems as the paint under the scuttle is good. If you look at the bonnet when the proofing is off, you will see that the holes can drip into the strength bars and run along them. This means it can get wet and any part of the proofing.
I sent this in your PM reply.