Just use it at night! Sorry Woody couldn't help myself.
We had one canvas that was thin and let a lot of light in so we spray painted it and that worked.
I've thought about spearing in the dark, just need some submersible lights down the hole. Not sure if it is legal?
Not in a corner.
I am updating to a newer flip-over this year. Probably going to get a 'Frabill R2-Tec Guardian'. These appear to be the darkest flip-over I have seen. Have not looked at the Canvas Craft yet. Will look at the Ice Fishing Show this weekend.
The seams have some tiny pin holes (literally). So I need something that is flexible to keep out the light.
I am thinking about trying 'Flex Seal', the informercial sealant in a spray can. Looks to be about perfect for this application. Anybody have any experience with this stuff?