do you have to apply on both sides of the seam or just one side? also if it's one side, is it the inside or outside? thanks!

Hello, Thank you for the question. For the best seal I would recommend applying to both sides. Apply one side allow it to dry and then apply the opposite side. Please let us know if we can further help in any way. Thank you, Justin J. HouseofScuba

How many tubes would be needed to seal a 2-person sil nylon tarp? It has a ridge seam and two "gable end" seams.

One tube should do the job, unless you really goop it on thick and heavy. I have been working on a rainfly for a 4-person tent. It has many seams so I had to get a second tube. A two-person, simple tarp should pose no problems to cover with a single tube, IMHO.

Will this work on an older tent to seal the seams?

Hello Buzz, This sealant is designed to seal up seams coated in silicone which occurs on most tents. I would double check that your tent has silicone treated seams but it most likely would work without any issues. Please let us know if we can further help in any way. Thank you, Joe P. HouseofScuba

Can I use this to adhere screen mesh to patch a 4 inch hole in the mesh portion of a lightweight tent?

I think it would work fine. Down side is that there is not as much surface area for the adhesive to bond to. I personally would hand stitch the patch to the screen and then go over the stitching and the overlapping portion (border) of the patch with the Seam Grip.

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GEAR AID Seam Grip SIL Silicone Sealant for Silnylon Tents and Tarps

Product ID: 3715878

Details

Brand
GEAR AID
Item Weight
1.92 ounces
Item dimensions L x W x H
4.88 x 1.05 x
Material
Silicone
Style
Sealant 1.5 Oz

💧100% waterproof, flexible seal

🧵Seals up to 24 ft of seams

🌡️Withstands extreme heat & cold

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€ 16.83

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal it, stretch it, survive it — your silnylon’s new best friend!

SEAL EVERY SEAM LIKE A PRO - Covers up to 24 feet with just 1.5 oz—max efficiency for your silnylon gear.
FLEX STRETCH WITHOUT FEAR - Elastic silicone formula moves with your fabric, no cracking or peeling over time.
WEATHERPROOF YOUR ADVENTURES - Creates a durable, waterproof barrier that laughs in the face of heat, cold, and rain.
TRUSTED BY OUTDOOR ENTHUSIASTS - Top-rated with 4.6 stars and backed by a 2-year warranty—gear up with confidence.
ULTRA LIGHT GEARS BEST FRIEND - Perfect for silnylon tents, backpacks, tarps, and rainwear—keep your kit dry and light.

GEAR AID Seam Grip SIL is a premium 1.5 oz silicone sealant designed specifically for silicone-treated fabrics like silnylon tents and tarps. It seals up to 24 feet of seams with a flexible, waterproof bond that resists extreme temperatures and won’t crack or peel. Ideal for ultralight outdoor gear, it ensures long-lasting protection against water intrusion, backed by a 2-year warranty and a strong 4.6-star user rating.

Specifications

ASIN	B0009RP8HO
Best Sellers Rank	#11,946 in Automotive ( See Top 100 in Automotive ) #4 in Silicone Sealers #618 in Oils & Fluids
Brand Name	GEAR AID
Color	Clear
Compatible Material	Silicone-treated Fabrics
Customer Reviews	4.6 4.6 out of 5 stars (1,600)
Global Trade Identification Number	00021563104400
Included Components	Seam Grip+Silicone Tent Sealer
Item Dimensions	4.88 x 1.05 x 8.01 inches
Item Form	Gel, Liquid, Paste
Item Type Name	Silicone Sealant
Item Weight	1.92 ounces
Manufacturer	GEAR AID
Material Type	Silicone
Model	10440
Number of Items	1
Part Number	10440
Style Name	Sealant 1.5 Oz
Surface Recommendation	Fabric
UPC	731673036149 021563104400
Unit Count	1.5 Ounce
Warranty Description	2 Year Warranty
Water Resistance Level	Waterproof

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