Alternatives to overpriced urethane seam sealers?

You can buy urethane adhesives in bulk if you really need a lot, but it really isn't going to save over a 6-9 $ container of seam grip which usually includes a brush or two. Buying a lot does not make sense unless you need it all at once as the stuff has a tendency to dry in the container unless you remove all the air.

Shoe Goo is basically the same as Seam Grip if that's what you're looking for. Quite a bit cheaper.

Don't some people here also use auto/RV silicone windshield sealer (diluted w/mineral spirits)?

I don't recall the brand, but I got some at WallyWorld that worked great for sealing a tent window I sewed on…

Thanks for the replies!

@Jim I agree, I don't want to buy a 5 gal pail of the stuff.

@Brendan Thanks, I didn't know about shoe goo. Do you think white gas would be ok to dilute it?

@Valerie I want to seam seal a PU coated 2006 REI Quarterdome. From what I've been reading, an urethane sealer is recommended. I haven't found people claiming silicone sealer works on PU coated fabrics, but it may very well work, especially on the non-coated side of the fabric.

@Valerie….the silicone sealer you are referring to is Permatex flowable silicone windshield and glass sealer. No need to thin it. I've used it on my tarptent straight out of the tube. Works great. Around $3 in an auto goods store.

> Permatex flowable silicone windshield and glass sealer. No need to thin it.
Yup, undiluted, good stuff.

Cheers

Silicone should no be used with PU coated fabrics (only on siliconised nylon/silnylon) as polyurethane polymer (Seam Grip) should not be used on silnylon.
Think of diesel in diesel engines and gas/petrol in gas/petrol engines.

I ended up buying Amazing Goop (the plumbing variety). I made a slurry with white gas and used it on the fly seams and some boot seams.
Thanks everyone for the help!