How to make fabric corners / Tacky glue waterproof?

[Lalla]

Hi,
I have two questions.
First I will go with the easiest ...
does anyone know if Tacky Glue (brown bottle) is waterproof when dry?

Second, I am trying to line a hole inside foam with fabric, how can I do the corners without cutter or sewing but so that they will be smooth and not all of the bulky fabric looking ugly in each corner?
Any ideas?

Thanks so much,
Lalla

[Craft Forums]

[sarabell]

tacky glue is water RESISTANT but not completely waterproof.