I made a nice big Tyvek tarp for myself a few months back, and used brass grommets in each of the corners. I reinforced the corners with another layer of Tyvek and added some tape, then grommetted.
So here are my questions:
1. I think this would weaken the fabric less than sewing--no "postage stamp" effect. Do you agree or disagree? Why?
2. This seems like it would be more or less equal weight than adding a Tyvek loop and anchoring it with tape. Can you think of why a loop would be better to use than a grommet?
3. What are the downsides of using grommets that I'm not thinking of?