How to Fix a Main Gasket With Liquid Glass

Reviewed by Charley Helvy

Last Updated: February 19, 2026 Approved

This is supposed to be a temporary fix but I know someone who followed this five years ago and his car still doesn’t leak water.

Steps

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^{[1]
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Research source} Purchase new thermostat and associated thermostat gasket(s).
Also disconnect the large hose from the top of the radiator.^{[2]
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Run water through the large hose which was disconnected from the top of the radiator and leads to the engine. Watch the water coming out of the large hose which was disconnected from the bottom of the radiator until it turns clear. Do the same to the radiator by running water through the top and watching it pour out the bottom.^{[4]
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Add the liquid glass and mix thoroughly.^{[5]
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Top off the coolant system with hose water. Cap the radiator.
Wait until the water level drops in the radiator and top it off again with hose water.
When liquid glass heats up it is activated. When it cools down by contacting air it will harden as when it seeps out of the leaky gasket.
Wait about 15 minutes and drain the coolant system without burning yourself.
Install the new thermostat with gasket.^{[6]
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Research source} Ensure the coolant system is put together properly.^{[7]
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Community Q&A

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Question

Will my car start after I put in liquid glass?

Community Answer

If the reason your car wouldn't start was a leaky gasket, this should help. Keep in mind it is a temporary fix which only lasts up to six months.

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Question

Can I put liquid glass in an engine?

Community Answer

No - it will kill your engine. Only use it in the cooling system.

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Question

How much liquid gas is needed?

Community Answer

Fill the radiator halfway with water -- use 1/2 cup if the vehicle runs hot while driving more than an hour. If vehicle runs hot quickly, use one cup. Remember to run the vehicle for about an hour afterwards -- if it doesn't get hot, you're good. If it runs hot after you use the sodium silicate, repeat the process. If the cylinder head is cracked, it may not work.

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