Will this work for a jetski?

It's a great epoxy, it worked on everything I've used it for. I don't have a jet ski, but I have used it on my boat. However, a Jet ski needs a water proof, strong solution, that can really take the pounding. You should also look at 3M's 5200 Marine Adhesive sealant.

I know this is unconventional, but would this work to seal a very tiny A/c condenser leak? My teen’s car and it is older & not worth the $1200 repair.

I've used Marine-Tex for years, for every kind of repair. Epoxies made for marine use are the best, another you could look at is 3M Adhesive sealant "Fast Cure 5200". Considering the alternative, ($1,200.00 repair) it's well worth a try. Be generous, clean the surface, and then cover the leak with a glob. Marine -Tex is a 2 part epoxy, put the caps back on, and you have it for future repairs.

Will this hold the water jacket side of a motor block?

I'm not sure, marine tex can be sensitive to extreme vibration. However, it sounds like you will need a lot more marine tex than these 2 little tubes will provide. I recommend you consider the original 2 oz or larger marine-tex. This will provide a long lasting great bond. I've used it on car engine parts, and I used it once to fix a hole in a 65 Johnson outboard motor.

does surface have to be dry when applying marine-tex?

It best to have the surface dry.

RM320K Rapid-Set

Product ID: 5814486

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Details

Brand
Marine Tex
Specific Uses For Product
Repair Bonding
Material
Epoxy Resin
Item Form
Paste
Special Feature
Rapid Set

🌊waterproof & marine-grade

⏱️1-hour rapid cure

🛠️1:1 epoxy paste ratio

Description

🛠️ Fix it fast, fix it right — Marine Tex RM320K keeps you afloat and ahead!

PRECISION APPLICATION - High viscosity paste fills cracks and voids with ease, ensuring a strong, lasting bond every time.
LIGHTNING FAST REPAIRS - Cures fully in just 1 hour at 72°F, minimizing downtime and keeping you moving.
MARINE GRADE DURABILITY - Waterproof formula designed for dockside and at-sea mechanical repairs that withstand harsh environments.
UNIVERSAL BONDING POWER - Adheres seamlessly to fiberglass, steel, aluminum, wood, cast iron, and many hard plastics for versatile fixes.
SECURE HARDWARE INSTANTLY - Perfect for locking down loose fasteners and securing hardware without delay.

Marine Tex RM320K Rapid-Set is a professional-grade 1:1 epoxy paste that cures in just one hour at 72°F. Designed for quick, durable repairs on a wide range of materials including fiberglass, metals, wood, and plastics, it’s waterproof and ideal for marine and mechanical applications. This 2 oz high-viscosity paste fills cracks, bonds surfaces, and secures hardware, making it the go-to solution for rapid, reliable fixes both dockside and at sea.

Specifications

Brand	Marine Tex
Specific Uses For Product	Repair, Mechanical, Bonding, Filling, Securing
Material	Epoxy Resin
Item Form	Paste
Special Feature	Rapid Set
Color	White
Item Package Quantity	1
Package Information	Tube
Item Volume	2 Fluid Ounces
Viscosity	High Viscosity Paste
Full Cure Time	1 Hours
Water Resistance Level	Waterproof
UPC	705643301803
Global Trade Identification Number	00705643301803
Manufacturer	Marine-Tex
Model	RM320K
Item Weight	2.39 ounces
Product Dimensions	8.5 x 4.5 x 5 inches
Item model number	RM320K
Manufacturer Part Number	RM320K
OEM Part Number	PHR3018U
Special Features	Rapid Set

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