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Old 1 Week Ago
Flash635 Flash635 is offline
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Default Waterproofing a soft top

I've read in place not to use any silicone based waterproofers but I've never seen a reason why.

I've read about people making their own oilcloth mixture that seems to work well.

The nano hydrophobes are my preference but they're expensive and don't seem to last long.

What did they use before nano hydrophobes were invented?

Opinions and thoughts please.
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Flash635 Flash635 is offline
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What? Nobody waterproofs their convertible top?
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mwinks93 mwinks93 is offline
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Tons of threads on this if you search. I am a huge proponent of 303. Some paint it on with a brush others use the spray bottle. You need to do a lot more prep for the spray bottle as you are supposed to keep the stuff off the glass and paint. But I still spray.
Big holes can be fixed with canvas tent glue. I forget what brand I used for that but I fretted over the silcone thing for awhile as well, and long term the glue may have been a mistake we shall see.
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mwinks93 mwinks93 is offline
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Oh and the silicone apparently eats at the layer of eater proofing inside rhe canvas or soemthing like that. And actually Ive never seen a thread on making your own concoction, so my apoligies for that, didnt mean to sound glib.
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Originally Posted by mwinks93 View Post
Oh and the silicone apparently eats at the layer of eater proofing inside rhe canvas or soemthing like that. And actually Ive never seen a thread on making your own concoction, so my apoligies for that, didnt mean to sound glib.
The thread on make your own waterproofing wasn't on this forum.
I've seen it come up a few times, variations on oilskin: beeswax and other ingredients.

My real curiosity was what was used prior to nano.
What makes canvas waterproof?

You don't always get what you need from searches, it's better to talk directly to someone rather than try to make sense of a 10 year old post.

Google searches show up oilskin reproofers or water based PVA products.
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I found your thread from 2 years ago: how long does the 303 last?
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multisaabguy multisaabguy is offline
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I purchase the gallon bottle of 303 for cost reasons and do my verts annually, they are still beading water but figure it is cheap insurance for old tops.
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I purchase the gallon bottle of 303 for cost reasons and do my verts annually, they are still beading water but figure it is cheap insurance for old tops.
I would too, it's not so cheap here.
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Agreed, 303 once per year, 32 oz spray bottle is less than $20 and does the whole job.
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Agreed, 303 once per year, 32 oz spray bottle is less than $20 and does the whole job.
16oz = $40 here.
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You are on the coast, I'd imagine you have any number of local marine supply stores that have a selection of waterproofing treatments for canvas.
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Originally Posted by jakejm79 View Post
You are on the coast, I'd imagine you have any number of local marine supply stores that have a selection of waterproofing treatments for canvas.
Definitely. I got StarBrite a little while ago, and that's nothing but a marine canvas waterproofer. Worked like a charm. My roof leaked like a sieve and three coats of the Starbrite rolled on and brushed on the seams and around the circumference did the trick. You should be able to get something similar if you can't get that.
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Originally Posted by 89TurboFury View Post
Definitely. I got StarBrite a little while ago, and that's nothing but a marine canvas waterproofer. Worked like a charm. My roof leaked like a sieve and three coats of the Starbrite rolled on and brushed on the seams and around the circumference did the trick. You should be able to get something similar if you can't get that.
Is Starbright an oil type of waterproofer?
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Quote:
Originally Posted by 89TurboFury View Post
Definitely. I got StarBrite a little while ago, and that's nothing but a marine canvas waterproofer. Worked like a charm. My roof leaked like a sieve and three coats of the Starbrite rolled on and brushed on the seams and around the circumference did the trick. You should be able to get something similar if you can't get that.
I just had a look on the StarBright website, there's Waterproofing With PTEF and Ultimate Fabric Guard.

Ultimate Fabric Guard says it has a UV protector.

That's 303's claim to fame too.
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