You can try the pool liner repair sealant. I used it to repair flatbed tarps when I ran 18 wheelers over the road to good effect.
I would use yellow carpenters glue.
You haven't said what the canvas is to be glued to. -Try silicone, it sticks many things like canvas.
To repair a canvas ceiling, first, identify the damaged area and clean it thoroughly. If there are holes or tears, use a patch of similar canvas material, applying a strong adhesive or fabric glue to secure it in place. For larger damages, consider sewing the edges together or using a canvas repair tape. Finally, ensure the repaired area is properly sealed to prevent moisture damage.
Hot hide glue mixed with 10% glycerin for flexibility.
To effectively glue seashells to a canvas, first clean the shells to remove any dirt or debris. Then, use a strong adhesive like epoxy or hot glue to attach the shells to the canvas. Allow the glue to dry completely before displaying or hanging the artwork.
Use glue that use made for pottery and follow the instructions on the glue.
To effectively waterproof a pop-up camper canvas, you can use a waterproofing spray or solution specifically designed for canvas materials. Make sure to thoroughly clean the canvas before applying the waterproofing product and follow the instructions carefully for best results. Additionally, consider applying a seam sealer to reinforce the seams and prevent water from seeping through. Regular maintenance and reapplication of waterproofing products can help keep your pop-up camper canvas protected from water damage.
Elmer's new China and Glass Glue.
Epoxy is best for that.
super glue
You can use super glue to repair your shoes, but there are also glues made specifically for shoes. Shoe Goo is a popular brand of commercial grade super glue made for shoes.
A good epoxy .