Is it fine to pour this into an empty radiator and then add the coolant and water, and then run the engine with the heater on?

You are supposed to pour it into a hot radiator after the engine has been running for at least 10-15 minutes, I ran it for 20 minutes. I have seen a lot of negative reviews for this item and most of the people were not following the instructions. It’s up to you but I would pour it into a radiator that has water and is hot. Hope this helps.

I drive a Vauxhall Astra where do I put this product in the engine or in the coolant

Shake the product well and add to the coolant do not put it into the engine

Iam getting water around my spark plugs will this seal the plugs

Hi Steven - clearly, you ought not to be getting water around spark plugs!! I just am curious as to how the water arrived there, as it does not sound like an engine coolant leak, so my answer would be no, in this case. It is something that requires looking at, obviously - and by a mechanic, since there may be a way for this to occur. I have never encountered it - the closest was having the plugs bathing in an oil bath, for some reason - we never did figure out exactly why - but water?? My apologies, I cannot assist further - I would be hot-foot to my SAAB people, tho' I might have a look around first to see if there is another source for that troublesome fluid!! That's is all I can say. Good luck - Ross.

What is the quantity in the plastic container?

If you read the info sheet it tells you 250ml

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🚗 Seal the deal before your engine feels the heat!

TRUSTED LEGACY - Backed by 100+ years of Holts automotive expertise.
EFFORTLESS LEAK FIX - Just pour in and watch it seal—no draining needed.
ANTI CORROSION POWER - Protects your entire cooling system from future damage.
COST SAVING SOLUTION - Avoid expensive garage repairs and part replacements.
VERSATILE APPLICATION - Seals engine blocks, cylinder heads, hoses, and more.

Holts Radweld Plus is a professional-grade, easy-to-use coolant leak repair sealant that instantly seals leaks in radiators, engine blocks, cylinder heads, and hoses without draining your system. Its anti-corrosion formula protects your cooling system while saving you costly repairs, compatible with all car models, and backed by over a century of Holts automotive innovation.

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Manufacturer	Holts
Brand	Holts
Model	Radweld Plus
Product Dimensions	7.6 x 14.2 x 3.2 cm; 280.66 g
Item model number	RW2GA
Manufacturer part number	RW2RGA
Item Weight	280 g

Holts Radweld Plus Coolant Leak Repair, Total Coolant Leak Repair, Industry Leading Car Radiator Leak Sealant, Easy To Use, Seal Engine Block, Cylinder Head, Hoses & More, Suitable For All Cars, 250ml

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