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REVIEW: Granville Heavy Duty Rust Cure

Special thanks to Mart and his Mustang - 1966 coupe V8 289. Thank you for sharing your review to the Frost community.

(Visit the original blog at http://onemanandhismustang.com/ )

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Granville Rust Cure Heavy Duty

Cost: 250ml – £10 (reviewed here),

1 litre – £20,

 5 litres – £80.

Background:

There are many many rust treatments out there, most of them are chemical reactions to the rust particles and it somehow converts it. It’s clever, I’m not a chemist so I don’t know exactly how it works. Some are better than others, I Use POR15 for areas that need paint like under the fenders etc where something will get punishment. I have been advised POR that its is not designed or recommended to treat the whole car, like the painted surfaces. As a result I am looking for something that will do the job on the painted side. After speaking to Frost they advised me of this stuff called Granville Rust Cure Heavy Duty. I have used this a while ago when I slapped a single coat on without care to see what it does. I posted a little video on my YouTube Channel (link here), “OnemanandhisMustang”, called “66 Mustang & Frost products I use”.  This was very much an experiment and I only put a single coat on. But the rust didn’t get any worse. So today I decided to try the Granville Rust Cure (Grc from now on), to see what it was like if I used it properly. Here goes:

 

Product Description:

Granville Rust Converter is the rust convertor used by the oil and marine industries, the MoD and NATO.

It is used to stop corrosion in environments far more severe than your car will ever see . . . and it WORKS.

Drying to a tough gloss black finish it can then be top coated with most paints.

Environmentally and ecologically safe. Acid and lead free. Non-flammable.

MUST be applied to rusted ferrous metals. Kills old rust and stops new forming.

Sounds impressive, but is it?

 

The Tub:

 This comes in three sizes, the size I have here 250ml, 1 litre or 5 litres. With 5 ltr I expect you can dip the whole car in it. This stuff does seem to go a long way. The instructions say pour into a non metal container ans apply thin coats between certain temperatures.  There is also a reference to not store below freezing. Not sure what the temperature does to it but I store it in the house, much to the wife’s disgust.

Rust Cure front

Rust Cure front

Rust Cure back

Rust Cure back

The mixture

The mixture

 

Application:

I will use this treatment on the brake drum that I had previously taken off. The drum had a fair amount of surface rust on it so it was a perfect candidate. I lightly wire brushed off the loose rust ready for the application.

The first time I spread this on a rust patch it was full of bubbles when I applied it to the rear window channel. Why I don’t know, none of the other converters do it. In fact it annoys me, a lot. Other’s are very watery like and run off, that annoys me too, but no bubbles, grc is thicker so no run off.

This stuff looks like milk and spreads like a watery single cream. The back of the pot advises to stir lightly, I guess that is so you don’t fill it with air. I poured a little in a plastic take out container. The instructions advise to lightly dampen the surface in order to help adhesion.

Drum before treatment

Drum before treatment

de-rusted and dampened with a little water and almost allowed to dry

De-rusted and dampened with a little water and almost allowed to dry

 

A small brush was used to apply it. Almost immediately the white milk bubbles and starts to change colour to light blue. I quickly went all around the drum and applied a thin layer as recommended. The pot does not say anything else, but as this was an experiment I started to play. I started to go over it again, to smooth out the bubbles, this was looking good, it was starting to thicken fractions at a time.

First application, bubbles showing.

First application, bubbles showing.

2 mins later, starting to smooth out nicely

2 mins later, starting to smooth out nicely

Inside, not on the brake surface though.

Inside, not on the brake surface though.

 

 All the time the colour was getting darker, the photos show the transitions, Grc dries to the touch in about ten minutes. I expect faster in warmer weather. I went over a third and fourth time. Now it was smooth. It dries to like a plastic type feel coating that is clear and turns the rusted parts black.

5 mins later

10 mins, still drying at this point , hence the lighter colour on the splines.

10 mins, still drying at this point , hence the lighter colour on the splines.

 

 

Second Coat:

 (I’m back, not that you would know I have been away!) I have taken some pictures of the first coat once the Grc had dried this morning. I then applied a second coat. This time I have taken a close up of the bubbles.  This time they seemed to disappear without to much hassle, the secret is this, as the mixture gets a little tacky just make sure you spread it around a bit more and make sure it’s not to thick.

Front drum single coat

Front drum single coat

Second application started

Second application started

Outside completed second coat

Outside completed second coat

Inside with single coat

Inside with single coat

Inside second coat

Inside second coat

 

 

 

Bonus time:

Bonus? Yep, this time I have taken a video of the rear drum from start to finish of the first coat. After that there is not much to see. So I have posted the video on YouTube under my channel “One man and his Mustang” under “Granville Rust Cure” or click here for the quick link, it’s worth a watch. If not only to see how my editing skills are coming along!

Rear drum before cleaning inside

Rear drum outside before cleaning outside

Rear drum outside before cleaning outside

Rear drum single coat

Rear drum almost dry

Rear drum almost dry

rear drum touch dry

Rear drum touch dry

 

 

 

Results:

This is difficult – I can review the product how it goes on, and I don’t know if its any good at keeping the rust at bay. That will have to be a long term follow up. So how do I rate it. I can do a longish term comparison by the single application I applied to the rear window patch. By the fact it has not come back after a random slapping of it on there says something.  The fact it has bubbles and to get it smooth you have to keep re-brushing, that drove me nuts.  But 12 hours later I am pleased with the results so far. 7 hours after I video the drum I have checked it again, it’s now an almost matt black! It works, (for now).

 

Rating: 9 out 10

The application is a single step (for each coat). That alone is a major bonus. The fact it bubbles until it’s smoothed out is pain. But, I can put up with that if it works long term.  On the drums the bubble effect went away pretty much of its own accord, perhaps it was on rusted metal and not on paintwork had something to do with it. I can’t give it full marks until I know it will stop the rust. So for now, I can only rate on test patches and the drums as they are now.

 

Conclusion:

The front drum has gone matt black, the second coat has seen to that. The rear drum first coat has gone a brown black in comparison. I’m pleased with it.

However, I am still not convinced how this will look on a painted side of the metal. I need to experiment on a little bit more.


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