Moroso Ceramic Sealer and Aluminum Radiators

[Tom C.]

Has anyone had any experience/success with the Moroso Ceramic Sealer and a "weeping" aluminum radiator? Would it be possible to effect this treatment with the radiator out of the car and under heated water pressure?

[Bill B.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Tom - I personally would not use any kind of sealant in my radiator. This Moroso ceramic sealer would do the trick but also might do some harm. Depending on the quantity used, will seal the weeping problem at the cost of plugging other cooling tubes and could cause loss in cooling capacity.

I would take the radiator to a reputable repair shop and have it pressure tested and repaired professionally to be on the safe side, but thats me.

Bill

[Tom C.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Thanks Bill, I plan to do just that. If I try that repair, I will circulate the stuff with the radiator out of the car. I bought it used, and if it can't be fixed, I will have to go the DeWitts repo anyway..

[Joe L.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Thanks Bill, I plan to do just that. If I try that repair, I will circulate the stuff with the radiator out of the car. I bought it used, and if it can't be fixed, I will have to go the DeWitts repo anyway..

Tom-----


If this radiator is old (which it likely is since the last time an aluminum radiator was used in a Corvette prior to the C4 era was 1972), I think you're fighting a losing battle. No matter what you do, I don't think you'll end up with a RELIABLE radiator even if you do squeeze a little more life out of it.

[Alan S.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Hi Tom,
The aluminium radiator in my 71 was in beautiful shape cosmetically, but wept.
I took it to several shops that thought they could at least help... to no avail.
There's now a DeWitts radiator in it's place and the original is on the shelf hoping for a miracle cure.
Regards,
Alan

PS: I found they've come down in price since they were first introduced.

[Tom C.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Thanks Guys, I bought this thing on Ebay and believed the Moroso sales pitch the seller gave me because I WANTED SO BAD to believe it. Live and learn.

[Dick W.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Usually the aluminum is so oxidized and thin it is almost impossible to Tig weld it. You can never get it clean enough to get a good weld

[Bill B.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

In the Navy when qualifying for air frames we used a manifold burning with argon gas over effected area to prevent any contaminations from entering into the aluminum and to keep the aluminum pure while welding. As far as aluminum is concerned this was a standard and any variation of this would result in an impossible weld. But then that was 25 years ago and what was then may not be true today? Please advise me of any revisions or changes. I appreciate it,
Bill

[Dick W.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Bill, the aluminum is usually so oxidized that it is impossible to get it clean enough to Tig. The chemicals in the coolant and the electrolysis that usually occurs contribute to this

[Bill B.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Dick - I understand, thanks

Bill

[Richard M.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

Tom, I bought a 62 aluminum radiator some time back. It looked great on the outside, but leaked terribly when the radiator shop tested it. After 2 attempts at a welding shop to weld the pinholes in the tank, I gave up. I ended up with a new Dewitt's.

I found out later from someone familiar with these, that if they're stored dry for years, they will ultimately corrode. If they were filled with coolant when stored, they'd likely be ok. I imagine the testament is that our 63 still has it's original "63A" radiator in it.

Many of us have made these mistakes. You are not alone.

Rich

[John H.]

Re: Moroso Ceramic Sealer and Aluminum Radiators

I found out later from someone familiar with these, that if they're stored dry for years, they will ultimately corrode. If they were filled with coolant when stored, they'd likely be ok.

Here's why - from my article on DeWitt's aluminum radiators in the March '07 issue of "Corvette Enthusiast" magazine:

The Molten Salts Process: