I'm not 100% sure on this, but if its brand new you dont even need the copper coating. The copper coating is just for if you re-use a mhg.

 

I'm using it for "insurance" just in case the finish on the block and head isn't perfect. We had a machine shop do the finish and I've read on here that they don't get the finish smooth enuf.

 

Jsupra is right, you dont actually need the spray and is only needed if you are reusing the gasket, but it never hurts to have it. When ever i used it on mine I coated it twice, i think if you read the bottle it tells you that aswell.

Kruso

 

I put it on my MHG just a few weeks ago during engine assembly. I just sprayed a good coat on each side and let it become a little tacky, and slaped it on.

 

Hey, thanks! The bottle does say 2 or more coats. Like I said I needed the info retard style .

 

I used spray copper sealant on a Grex 2.0MM and it started coming apart within weeks and I had a BHG all over again a month later, with little flecks of copper in all of my coolant.

 

I used spray copper sealant on a Grex 2.0MM and it started coming apart within weeks and I had a BHG all over again a month later, with little flecks of copper in all of my coolant.

This worries me a bit.....i ran my hks mhg for 600 miles, got rod knock, got the block refinished, and sprayed the gasket with the copper......we'll see i guess

 

If the gasket has a coating on it already, do not use the copper spray. It can interact badly with the original coating.

Since the Greddy gasket is already coated, leave it alone.

If the gasket is bare, with no coating, then use the copper stuff.

 

Thanks for the additional advice, guys, but the gasket and head are on there already. The GReddy gasket seemed like bare metal, no coating. We cleaned it with brake cleaner, sprayed the copper stuff on there and put the motor back together. I'm crossing my fingers that it's okay. If we have any probs I'll report back on here that it didn't hold.

It would suck to have copper flecks in the coolant and motor!

 

Darn, sorry for the misinformation. I mistakenly looked up the HKS gasket being coated, instead of the Greddy one.

I guess the Greddy is bare then. You'll be fine with the copper coat, so no worries.

 

i can't recommend the copper crap.....reused several MHGs w/no coating and no ill affects....

 

I wasnt planning on using it either, but when i recieved the greddy MHG, it was bare metal so i decided to go ahead and use it.

 

I wasnt planning on using it either, but when i recieved the greddy MHG, it was bare metal so i decided to go ahead and use it.

Hey, conundrum07, how many miles have you put on the new HG with the copper?

 

I used the copper spray when I changed the gaskets in my JDM I used a stock headgasket with stock bolts, sprayed the block, head & gasket with the spray let it get tacky. Plopped it all together torqued it up and its been running strong at 13psi for more than 20k miles now.

 

FWIW I think the Greddy gasket does have some kind of coating on it. I started to clean the gasket w/ acetone and what looked like some type of black coating started to come off, so I left it alone and installed it dry.

Dale H
87T

 

i have reused the 2mm hks mhg about 5 times with no problems. i just spray 3-4 decent coats on each side. if its a new gasket i wouldnt spray it on there though. shouldnt need it.
william

 

GReddy gasket DOES have a coating. What it is I do not know, but GReddy recommends not cleaning with harsh chemicals.

 

put some regular motor oil on both sides of (to treat it) it and torque it down. Dont need all that sealant crap

 

i have reused the 2mm hks mhg about 5 times with no problems. i just spray 3-4 decent coats on each side. if its a new gasket i wouldnt spray it on there though. shouldnt need it.
william

You have got to be kiddin!?!? I've never heard anyone reuse them.

 

i have reused the 2mm hks mhg about 5 times with no problems. i just spray 3-4 decent coats on each side. if its a new gasket i wouldnt spray it on there though. shouldnt need it.
william

how did you do it though? Did you clean the excess black sealer off it first and then spray? Also, did you have to clean and respray in between the layers too, or are those all stuck together so you dont need to??

 

id really love to know as well if anyone has any clue

I am reusing my HKS 1.2mm mhg and there is black coating on the head and block and some still on both sides of the MHG. I plan on cleaning the block and head and thencleaning the sealant off of the MHG and covering it with coper spray. Is this the right thing to do or should i just put the MHG back on without any cleaning and expect that the sealant will rebond to the gasket on whatever side it came off of?

Thanks

Dave

 

I sprayed a couple coats on my new HKS MHG for insurance. Only put about 6000 miles on it since then but no problems so far.

 

I did the same thing as Serzy did, put a coat of CS on the OEM HG and torqued it down a bit, its been running good for a good +20K.

 

This worries me a bit.....i ran my hks mhg for 600 miles, got rod knock, got the block refinished, and sprayed the gasket with the copper......we'll see i guess

read the thread on how to minimize rod knock! What went wrong?

 

i have reused the 2mm hks mhg about 5 times with no problems. i just spray 3-4 decent coats on each side. if its a new gasket i wouldnt spray it on there though. shouldnt need it.
william

^^^^^^^^Agreed!