Will this work in my boat

I would say no, you have no cooling system to put this into because boats pump live water through the engine to keep them cool

I have a cadillac 4.6 northstar. should i use two bottles on it, or can i get away with one?

Your cadi is a v8.. therefore use 2. But please call them for special instructions pertaining to that motor.. you have to find which cylinder is leaking first and remove that spark plug, then run it up to temp with the spark plug out! Let it cool over night and run it up to temp a second and third time to heat cycle it. THEN put the spark plug back in.

how do i use steel seal>

follow the instructions closely.

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🚀 Seal the deal, save your ride—DIY like a pro!

TRUSTED BY PROS - Used nationwide by thousands of repair shops
COMPACT EFFICIENT - Lightweight 1.2 kg bottle fits easily in your toolkit
DIY FRIENDLY FORMULA - Simple pour-in solution—no mechanic needed
ENGINEERED FOR POWER - Specifically designed for 8-cylinder engines
PERMANENT ENGINE PROTECTION - Seals head gasket cracks for lasting engine health

STEEL SEAL Head Gasket Sealer is a professional-grade, permanent fix for blown head gaskets, cracked heads, heater cores, and freeze plugs. Designed for 8-cylinder engines, this easy-to-use, pour-in formula is trusted by thousands of repair shops nationwide, empowering DIY enthusiasts to restore engine integrity without costly repairs.

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Manufacturer	STEEL SEAL
Brand	STEEL SEAL
Product Dimensions	10.16 x 10.16 x 20.32 cm; 1.2 kg
Manufacturer reference	8CYL001
Manufacturer Part Number	8CYL001
Item Weight	1.2 Kilograms

STEEL SEAL Head Gasket Sealer for 8 Cylinder Engines -

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