Cheap knit material that is waterproof? or a way to make a knit material (like "tee" shirt fabric) waterproof?

I am designing a cover for a kayak and having a stretchy, waterproof cover would make the other parts of the design a whole lot easier.

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CameronSS8 years ago
Liquid latex comes to mind.

Or try Tim's thing.
drdunc1000 (author)  CameronSS8 years ago
I almost tried this.  I was at the store and tried to decide between two different brands - wound up forgetting to buy either one of them.  Next time I'll remember!   Who is Tim?
drdunc1000 (author) 8 years ago
I tried out the liquid latex (Casting Craft's Mold Builder-obtained from A.C.Moore) and it seems the best choice.  Not only does it work on the fabric (both unstretched and pre stretched) but I can use it to do molding of small parts. Right now I am making some cheap sprockets using epoxy and a mold I made from a nylon sprocket.
buy a wax ring used for sealin' a toilet to its base and rub th' wax into th' fabric
drdunc1000 (author)  gearhead19518 years ago
Is the melting point of the wax high enough that it won't be affected by the sun?
th' sun wiil quite likely melt th' wax ,  but that just means th' fabric will remain pliant ,  once you have it saturated ,  it will only bleed out so much and then stay waterproof !
Burf8 years ago
Could you use Tyvek with elastic in a gathered edge?
drdunc1000 (author)  Burf8 years ago
Tyvek is probably the cheapest alternative and I could probably get a local contractor to give me his scraps.  Do you know if it will tear if I try to sew pieces together.  Or is this the wrong way to do this?
Burf drdunc10008 years ago
The best way to join it together is with contact cement.  I've used this method with good success.
I think sewing it would weaken the Tyvek along the stitches, tearing through when put under a strain.
Why not use neoprene?  It seems you can get it somewhat inexpensively on eBay.
drdunc1000 (author)  AngryRedhead8 years ago
Would this be cheap enough?  If so this would be the best.  Am I correct in assuming that it holds up to light okay?
Quality fabrics are expensive.  Jersey (t-shirt material) is a very cheap fabric but won't hold up for an application that you're wanting to use it for.  Neoprene is the material they use for scuba suits, and I'm pretty sure it's the same material used for spray skirts.  I don't know much about the material, but it's definitely a point to research and decide if it's right for what you want to do.
Paint the whole thing with Plasti-Dip. It even comes in cool colors.
drdunc1000 (author)  RavingMadStudios8 years ago
I've got some of this at work.  I'll give it a try and let you all know the results.