Waterproof roof top bag


Well-Known Member
So i had a canvas bloke put me together a roof top bag out of heavy duty pvc canvas.

The bag is solid as with good overlaps on the zip with velcro

Issue is where he has had to join the fabric he has put a 2 inch overlap in but i can see daylight through the stitch holes.

I have tried wetting it but due to the nature of the fabric the cotton will not swell enough.

After suggestions to seal it.
Given the size of the overlap i am thinking something like sikaflex sandwiched between the two fabric pieces and then a bead on the outside of the joint too...but i am open to other suggestions


Well-Known Member
Another idea. You might want to test this on a small sample first, try the blue PVC pipe
glue on the inside of the seam.