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can this be used on a thermostat cover to instead of a gasket???
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I have an Audi TDI, which has a catalytic convertor. Is this product compatible? Thank you
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How long does Gun Gum take to properly harden
Question:
will Radweld seal a leak in an electric hot water heater (over a sink)
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Hello I own a 2005 Audi A6 2.4 V6 Petrol would this product be suitable to help with a small coolant leak for my car. I want to know before I go ahead
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does radweld use thick substances like Bars leak?
View all questions > Workshop & Tools Q & A > Garage Equipment Q & A > Head Gasket & Exhaust Repairs Q & A

Customer Questions & Answers for
Holts Holts Radweld Plus 250ml

Fix leaks in your car's radiator, engine blocks, cylinder heads or hoses with Radweld Plus.
Customer Questions & Answers:
31 Questions
 | 
55 Answers
Overall Rating:
4.75 out of 5
4.8
out of
5
Product Details

Questions & Answers for Holts Holts Radweld Plus 250ml

Question
Will Radweld Plus cure a pinhole coolant leak in the oil cooler housing?
I have a tiny pinhole water/coolant leak in the side of the oil cooler housing. A tiny jet of water is seen when the engine is running. Will Radweld Plus solve this? And will it pour directly into the expansion tank?
Attitude to Car Maintenance: Enthusiast
How many cars: 2
asked 3 years, 3 months ago
by
Anonymous
 - Hull
on Holts Radweld Plus 250ml
3 answers
Answers
answer 1
yes it will solve your problem just pour the whole bottle in to your coolant system and leave the car running on idel speed for 10 to 15 mins then top up your coolant system if needed its fab stuff
Age Group: Under 25
Gender: Male
Attitude to Shopping: Quality Seeker - I'd rather spend a little extra on something if I know its going to last
Family: I'm Single - With No Children
Attitude to Car Maintenance: Enthusiast
How many cars: 1
answered 2 years, 5 months ago
by
rd1102
 - west lothian
answer 2
Yes
answered 2 years, 7 months ago
by
MGZR2004
 - Sheffield
answer 3
Hi, thanks for your interest in Holts Radweld Plus 250m.The advice from the manufacturer is that depending on the size of the hole, Radweld Plus should work. It can be poured into the expansion tank, however ensure that the engine is run for at least 15 minutes or longer, and keep the system topped up with coolant/water. If this does not stop the leak it may have to be repaired or replaced.
Staff Answer
answered 3 years, 3 months ago
by
HalfordsWebTeam
Question
I have a small leak in my car radiator is it OK to introduce a sealant product eg Radweld via the reservoir?
asked 5 years, 4 months ago
by
Anonymous
on Holts Radweld Plus 250ml
3 answers
Answers
answer 1
Hi, will I had a coolant leak, and I put in it in the reservoir/header tank/coolant tank, works no problem.
answered 4 years, 3 months ago
by
Ceasar
 - South West London
answer 2
Yes, in fact the product advises that you can either pour directly into the radiator or the reservoir (and you may need to do both, depending on how much lost water you have in the radiator at the time.)
answered 5 years, 1 month ago
by
Tiggr
 - Bristol, UK
answer 3
Thats what i did and it worked, but i mixed it with coolant before pouring it into the tank as i heard it is less likely to clog something that way.
answered 5 years, 4 months ago
by
cordie
 - York
Question
Large Radiator Leak
I have a large leak from the bottom of my radiator that pretty much empties they system of fluid within a minute or two. Is this too big of a leak as i know you have to run the engine for a while for this stuff to work
asked 4 years, 8 months ago
by
John2502
on Holts Radweld Plus 250ml
3 answers
Answers
answer 1
This may work, I would suggest in getting two bottles, but it mix one with abit of coolant, so the system is not just full of the radweld.
answered 4 years, 3 months ago
by
Ceasar
 - South West London
answer 2
If the crack is really big , then answer is no.
answered 4 years, 4 months ago
by
Anonymous
answer 3
This sounds as if it is too much for Radweld.
Wondarweld may be worth a try, especially if you plug the crack with steel wool (if possible) but it sound like a pretty serious leak so it may need new radiator. The best advice would be to contact your local mechanic for specialist advice.
Staff Answer
answered 4 years, 8 months ago
by
HalfordsWebTeam
Question
will Radweld seal a leak in an electric hot water heater (over a sink)
Age Group: 65 & Over
Gender: Male
Attitude to Shopping: Quality Seeker - I'd rather spend a little extra on something if I know its going to last
Family: I'm Living with Partner/Spouse - No Children
Attitude to Car Maintenance: Enthusiast
How many cars: 2
asked 1 year, 6 months ago
by
qpal
 - Oxted, Surrey
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
I wouldn't use it in water you might drink!!!!
answered 11 months ago
by
vic46531429
 - Halifax, West Yorkshire, UK
answer 2
This product is for vehicle use and we could not recommend any other usage.
Top 10 Contributor
Top 10 Contributor
answered 1 year, 6 months ago
by
fishgut
Question
Compare to Radweld (blue container)
What's the difference between the Radweld Plus and basic (?) product.
Age Group: 55 - 64
Gender: Male
Attitude to Shopping: Quality Seeker - I'd rather spend a little extra on something if I know its going to last
Family: I'm Living with Partner/Spouse - No Children
Attitude to Car Maintenance: Novice
asked 2 years, 1 month ago
by
VBoy
 - Herts
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
Yes I can see the stated difference on the bottle. The question is more how/why is this different. The reason being I hear mixed report re using such products and wanted to understand the actual difference to take a view re a small radiator leak which both products claim to solve.
answered 2 years, 1 month ago
by
VBoy
 - Herts
answer 2
This product will also seal coolant to air leaks in engine block, cylinder head, radiator and hoses.
Best Answer
Top 10 Contributor
Top 10 Contributor
answered 2 years, 1 month ago
by
fishgut
Question
where do i pour this
do i pour this into the expansion tank with or without collant being present in the tank ??, and how much do i pour in
asked 4 years, 2 months ago
by
Anonymous
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
Empty the full contex in to the radiator not the expansion tank.
answered 3 years, 8 months ago
by
wolfblood
 - bridgend
answer 2
The 250ml bottle treats up to 21L systems. If the coolant capacity is 7L or less, use only half bottle.
Add either into the radiator or overflow reservoir (expansion tank), top up with recommended coolant if needed.
Radweld Plus is compatible with all forms of Anti-Freeze so there should be no problem with introducing it to a coolant system containing Anti-Freeze.
Staff Answer
Best Answer
answered 4 years, 1 month ago
by
HalfordsWebTeam
Question
Could this product cause problems with welding the rad should that become necesary?
ie. is there any chance they'll say "we could have fixed it but you've put radweld in so have a bill for a new rad instead"
Attitude to Car Maintenance: Enthusiast
asked 3 years, 5 months ago
by
WizzArd69
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
No. I have absolute confidence that no corrosion, or metal contamination will take place
Age Group: 65 & Over
Attitude to Shopping: Quality Seeker - I'd rather spend a little extra on something if I know its going to last
Family: I'm Single - With No Children
Attitude to Car Maintenance: Enthusiast
How many cars: 1
answered 2 years, 5 months ago
by
Pengalanty
 - Staffs & Worcs Canal, cruising South
answer 2
Hi, thanks for your interest in Holts Radweld Plus 250ml. Using this product for the job should not have an affect on welding the radiator.
Staff Answer
answered 3 years, 5 months ago
by
HalfordsWebTeam
Question
I have an Audi TDI, which has a catalytic convertor. Is this product compatible? Thank you
Age Group: 65 & Over
Gender: Male
Attitude to Shopping: Quality Seeker - I'd rather spend a little extra on something if I know its going to last
Family: I'm Living with Partner/Spouse - No Children
Attitude to Car Maintenance: Enthusiast
How many cars: 2
asked 1 year, 4 months ago
by
biggles26
 - tisbury sp3
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
Yes i used it on my mgzr with no prob
Age Group: 35 - 44
Attitude to Shopping: Pro-Performance - I'II always buy the best quality regardless of price
Attitude to Car Maintenance: Enthusiast
answered 9 months ago
by
sarah1973
answer 2
Yes - this product can be used with your vehicle.
Top 10 Contributor
Top 10 Contributor
answered 1 year, 4 months ago
by
GBenson
Question
how much radweld + should i use on a citroen zx 1.4 ?
asked 3 years, 2 months ago
by
Anonymous
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
The whole bottle
Top 500 Contributor
Top 500 Contributor
answered 2 years, 11 months ago
by
LordGunwharf
 - Portsmouth
answer 2
Hi, thanks for your interest in Holts Radweld Plus 250ml. The quantity of Radweld required will depend on the capacity of your cooling system. The 250ml bottle will treat 7-21L of standard coolant depending on condition of coolant. Therefore half the bottle would be suitable for 3.5L to 7L of coolant. Determine the capacity of your cooling system and then use a suitable amount of Radweld.
Staff Answer
answered 3 years, 2 months ago
by
HalfordsWebTeam
Question
Hello I own a 2005 Audi A6 2.4 V6 Petrol would this product be suitable to help with a small coolant leak for my car. I want to know before I go ahead
Audi A6 S line 2.4 V6

I have a slight coolant leak it's not losing it everyday.
Age Group: Under 25
Gender: Male
Attitude to Shopping: Pro-Performance - I'II always buy the best quality regardless of price
Family: I'm Single - With No Children
Attitude to Car Maintenance: Enthusiast
How many cars: 1
asked 1 year, 7 months ago
by
Viren
 - birmingham
on Holts Radweld Plus 250ml
2 answers
Answers
answer 1
yes mate try radweld it should do the trick
answered 11 months ago
by
vic46531429
 - Halifax, West Yorkshire, UK
answer 2
This product will be suitable for your vehicle and should stop the leak.
Top 10 Contributor
Top 10 Contributor
answered 1 year, 7 months ago
by
fishgut
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