will it adhere to rocks?

Yes. Silicone caulk will adhere to most things like stone and rock. The key is to make sure the mating surfaces are as clean and grease-free as possible.

Will this hold up to resealing a 850 gallon saltwater aquarium that’s 12’x36”x36”?

In my experience this is one of the only products out there which will bond glass to glass. I have used all of the colors and have never had a failure either by shear or pull. Properly prepared surfaces will ensure a good weld, but I would suggest a retention band around the rim and base- thats a lot of water! I have heard rumor that this is the product used in large scale aquarium builds, and I would suggest you call an aquatics center or aquarium to make sure. Hope it helps.

How many tubes will i need to reseal a 125gallon tank?

I think you can cover a 125 with three if you were really proficient, but I would get four just in case. The consistency is different than GE I and seems a little more thinner. It has a higher sheer force so it is very good if you are doing a complete rebuild (all glass separated) but if you are just resealing, you could probably get by with GE I. Hope this helps.

How many tubes will be needed for resealing a 33 gallon tank?

I have gone several standard 55 gallon tanks with a single tube. You must have a plan because silicone won't adhere to other silicone if it has been more than about 5 minutes. Be sure to start with a perfectly clean glass. I used acetone to wipe it clean just before starting. I only had one tank ever leak and it took almost 5 years. I was a small leak in a smaller tank and I resealed it again. Hope this helps.

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GE SCS1200 Silicone Construction Sealant, Black

Product ID: 8095133

Details

Brand
C.R. Laurence
Item Form
Liquid
Material
Silicone
Style
Compact
Water Resistance Level
Water

💧Permanent Watertight Bond

🌡️Wide Temperature Range (-40°F to 400°F)

🛠️High Modulus for durable strength

฿3599

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Description

🖤 Seal it like a pro — strength and style that lasts!

SLEEK BLACK FINISH - Adds a professional, clean look to your projects while blending seamlessly with dark materials.
AQUARIUM GRADE SEAL - Trusted by pros to create leak-proof, watertight seals even under constant water pressure.
UNMATCHED DURABILITY - High modulus silicone ensures long-lasting, flexible strength for demanding construction projects.
ALL WEATHER PERFORMANCE - Operates flawlessly across extreme temperatures, from freezing winters to scorching summers.
EASY ONE PART APPLICATION - Moisture-cure formula simplifies use—no mixing, no fuss, just reliable sealing power.

The GE SCS1200 Silicone Construction Sealant in black is a high-strength, high-modulus silicone designed for permanent, watertight bonds. Its wide temperature tolerance and flexible rubber cure make it ideal for demanding construction and glazing applications, including aquariums. This one-part, moisture-cure sealant combines professional-grade durability with a sleek finish, ensuring your projects stay sealed and stylish under all conditions.

Specifications

ASIN	B001G11JE8
Best Sellers Rank	#341,947 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #502 in Silicone Adhesives
Brand	C.R. Laurence
Brand Name	C.R. Laurence
Color	Black
Compatible Material	Rubber
Customer Reviews	4.6 out of 5 stars 55 Reviews
Item Form	Liquid
Manufacturer	C.R. LAURENCE
Material	Silicone
Material Type	Silicone
Number of Items	1
Number of Packs	1
Part Number	SCS1203
Style	Compact
Style Name	Compact
Surface Recommendation	Gutter
Water Resistance Level	Water Resistant

Reviews

H**E

I will take some getting used to working with it but I do like the look

I used this to rebuild an aquarium. I chose SCS 1203 which is black. It seems to be stronger than GE Windows and Doors and might have a slightly longer tooling time, but just an opinion. I will take some getting used to working with it but I do like the look. The only issue is it is a bit more expensive than the GE 1.

20.06.2016

G**0

Resealed a 72g Bowfront Aquarium

This stuff works Awesome! I resealed a 72g Bowfront Aquarium that had a leak..I filled up the tank after letting the silicone cure for almost a week..Not one drip! If you need to seal an Aquarium this is definitely the stuff to use.

12.12.2018

E**R

Great Psi strength.

Used in a 155 Bow front aquarium. Completely stripped out old silicone and replaced with Scs1200 Psi strength was the highest I could find and need the extra grab for supporting the straps and the Bow seam. I let cure 8 days. Awesome Stuff

27.04.2018

S**B

Five Stars

used it to re-seal my aquarium. worked well. no leaks so far.!!

19.07.2018

B**T

Good adhesive.

High quality adhesive product. Very water resistant! This is comparable to The Dow 795 product I've used in the past.

7.05.2014

K**.

Five Stars

It’s great.

9.01.2018

J**N

Five Stars

Yes

26.09.2017

Z**M

Stop upping the price for frequent buyers!!!

The price is crazy you guys keep upping it every time I restock, stop changing the price we you see people ordering it frequently! It works great on aquariums

4.06.2016

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฿3599

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Thailand.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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