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RandyHiker
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PostMon Aug 27, 2018 2:38 pm 
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schifferj wrote:
DIYSteve wrote:
GE Silicone II cut with Klean-Strip brand mineral spirits from Home Depot has worked well for me.

I forget the proper ratio.  Is it 1:1?

Thanks!

Not that much.  Start with the silicone and add just a little spirits,  mix it in and then add little bits more until you get it to a paintable consistency.
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Jeff
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PostMon Aug 27, 2018 3:24 pm 
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Adohrn wrote:
Need to seam seal a silynylon tarp, and needing to buy new mineral spirits.  It appears they have come out with new formulas that make the mineral spirits more eco friendly, but not good for sealing.   So how do I know which one I’am buying?

Avoid the odorless kind and you will be fine.
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Jeff
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PostMon Aug 27, 2018 3:27 pm 
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Has anyone tried mixing seam grip with mineral spirits? I need to seal my event bivy so no silicone. I've only tried thinning silicone in the past but not seam grip.
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DIYSteve
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PostMon Aug 27, 2018 4:31 pm 
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schifferj wrote:
I forget the proper ratio.  Is it 1:1?

I don't recall, or maybe I never knew. I just dilute the GE II silicone with mineral spirits until it's the right viscosity for brushing.
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InFlight
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PostFri Aug 31, 2018 10:22 am 
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Jeff wrote:
Has anyone tried mixing seam grip with mineral spirits? I need to seal my event bivy so no silicone. I've only tried thinning silicone in the past but not seam grip.

Seam Grip is marketed as Seam Grip +WP and Seam Grip +SIL

The Seam Grip +WP is Urethane based and comes with a cure accelerator.  I'd strongly suggest not thinning or diluting this stuff; unless there are some instructions on the package to the contrary.

The Seam Grip + Sil is pretty much plain pre-diluted silicon.  You can certainly thin this out a bit more if you don't like the consistency.

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RandyHiker
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PostFri Aug 31, 2018 10:37 am 
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InFlight wrote:
The Seam Grip + Sil is pretty much plain pre-diluted silicon.  You can certainly thin this out a bit more if you don't like the consistency

GE Silicone II clear caulking compound is the same stuff -- but much cheaper per oz.  The big tube at Home Depot is about the same price as the tiny tube at REI. AFAIK REI doesn't sell mineral spirits and little paint brushes.

If you've got just small item to seal (e.g. one tarp) probably makes no difference.  But for bigger items I find it worth.

Also I find applying the thinned silicone with a brush yields better results for a klutz like me that tends to end up with blobs using the SeamGrip stuff straight out of the tube.
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InFlight
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PostFri Aug 31, 2018 11:58 am 
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The flux brushes in the plumbing brazing section are dirt cheap (10-12 cents each in a package), and work great for seam sealing.

I also use them to lubricate parts with machining oil on the lathe and mill.  Really handy small throw away brushes.

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Franco
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PostFri Aug 31, 2018 7:59 pm 
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Seam Grip and the like can be diluted with Xylene , however I don't think it comes in small sizes and it is highly toxic.
When I used to seal Bibler and Black Diamond tents with Seam Grip I just had to put up with a somewhat thick  and visible finish .
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Navy salad
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PostFri Aug 31, 2018 9:29 pm 
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Here in the States you can get Xylene in one quart cans at most large hardware stores.
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Schenk
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PostTue Sep 25, 2018 9:21 am 
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In another thread DIY Steve stated that GE Silicone II doesn't dissolve in mineral spirits, but is held in suspension/makes an emulsion when mixed with mineral spirits.
I want to recoat a large portion of a good tarp and I wondered if I could use something else that would make an actual solution of diluted silicon and then paint it, or even roll it on.
I checked the MSDS for GE Silicon II and it indicated Toluene will dissolve it.
Has anyone tried using this solvent to thin silicon sealant?

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InFlight
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PostTue Sep 25, 2018 12:56 pm 
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Schenk wrote:
In another thread DIY Steve stated that GE Silicone II doesn't dissolve in mineral spirits, but is held in suspension/makes an emulsion when mixed with mineral .
I want to recoat a large portion of a good tarp and I wondered if I could use something else that would make an actual solution of diluted silicon and then paint it, or even roll it on.
I checked the MSDS for GE Silicon II and it indicated Toluene will dissolve it.
Has anyone tried using this solvent to thin silicon sealant?

I've only used mineral spirits before, but it's pretty easy to adjust the consistency of the "silicone goo" by adding more mineral spirts, or more silicone as needed.  I'd simply dilute it a lot and see how it spreads by a brush on some rag.  Adjust until it seems right, and have at it.

Harbor Freight has a $13 disposable paint sprayers.  If you or a buddy has an air compressor, you could give that a try for a more uniform coating.

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Schenk
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PostTue Sep 25, 2018 1:10 pm 
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Yah, from everyone's previous posts and comments it sounds as if mineral spirits work fine. I was just wondering if mixing with toluene and getting an actual solution would give even better results considering the thin application one would want when doing a large area (to reduce weight and stiffness).
Thanks!

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Schenk
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PostThu Sep 27, 2018 9:17 am 
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For what it is worth, here is my experience coating a 10' x 10' pop up shelter canopy, like an EZup.

I went with mineral spirits and a full tube of GE Silicon caulk to coat what is a bit over 100 sq. ft. Using a plastic jug, I mixed until I got a solution about the consistency of house paint. Shaking the mixture in partly filled a jug seemed to mix the 2 ingredients quite well.
I set up the pop up with the canopy installed beforehand, and went to work with a 6" micro fiber paint roller, and an extension handle as soon as I had the mixture to the proper consistency. I experienced no "settling out" of the silicone while I applied the mixture to the canopy, but rolling it on went fast, so that could have helped.
It dried to touch quickly and seemed to be a nice, if not fairly even, coat. Left it overnight so a little humidity from dew could help with the curing, and this morning it was done.

I am pleased with the result and could recommend this for coating tarps, floors, and rain flys that the owner feels are worth salvaging.

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AlpineRose
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PostThu Sep 27, 2018 12:15 pm 
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This thread is another great example of why nwhikers is such a fine website.  So much useful, detailed knowledge not easily found elsewhere.  Thanks, everyone.
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ale_capone
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PostFri Sep 28, 2018 9:28 am 
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not all silicones are the same. ive used silicone suspended in isopropyl for dampproofing masonry. while dow 790's cure is alcohol inhibited.

we have silcone paint, but not in translucent.(no such thing as clear caulk. its really not clear if you put it on thick enough.

most clear caulks are acetate(vinegar) cure.

acteone, toluene, xylene, alcohol, might all have a differant affect on curing. also does things to the uv properties... is ge 11 a uv rated exterior caulk?

i wouldnt stray to far from diy steves advice. unless you want to exleriment on old cloth.
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