Anti sieze goo / anti corrosion paste

Having had one or two probs recently with corrosion of bolts into aluminium housings - thought I would investigate a bit further.....

Many years ago, when I was working in the aircraft industry there was a fluid called Alacrom? Which was, I believe a Chromate primer for Aluminium articles which needed to be "fettled" to fit. At the same time I used to use a yellow paste when fitting steel bolts thro Alloy panels. I believe that this was to reduce/stop electrolytic corrosion. I have subsequently found that this is called "Mastinox". Neither items are cheap, but should be very good in the less demanding automotive area.

I know some of you guys swear by generous ammounts of Copaslip, but
having had a look at the Molyslip site (manufacturers of Copaslip) I notice that they manufacture a product called "Aluslip" which seems to be an aluminium based version of Copaslip; but I could find no reference as to when or why you would use one or the other - except for "to be used when copper based products cannot be tolerated"

I also notice that they manufacture a couple (well lots really) of products that would be useful in a hostile (automotive) environment - such as "Rusolvent" - penetrates clearances and cuts through rust and corrosion to free and release corroded parts. Also Molyslip EHT - for those hard to get apart exhaust systems, as even if carbonisation occurs the residue will remain friable.


Have any of you guys tried any of these products? If so, what are your thoughts?<B>

aluslips the dogs bollox if a bit pricy, we used to use it on marine winches going off shore and never had any problems with corrosion or seizing,even after 4 yrs with the north se doing it's worst

copper grease contains so little copper it has vertually no bi-metallic catalytic effect (copper acts as a corrosive accelerator for aluminium) the trade as said use copper grease ( copaslip being a catchall term i personally use comma coppergrease) unless your using it on something like an aero engine i wouldn't worry about the minuscule detrimental effect of using copper grease

MHM to ressurect this thread,
I currently work in the aircraft industry and by far the best stuff we have is:

Bostik Never Seez Pure Nickel Special.

Absolutely tremendous stuff, we use it all over our engines and airframe for dissimilar metals and materials, magnesium alloys to steel to A/C grade alum. Never fails. Uber heat resistant too.
Had a quick look, its a bit pricey at about £30-£35 a tub on-line (i reckon if you ring an agent you could get it cheaper) but will last ages and is the ultimate.

we have the same problem in the cycle industry.With the common use of carbon and titanium it is a real problem.I have even seen carbon and carbon "rust and seize".
we now use silicone based lubricants.
On my landy i use silicone pipe jointing grease and so far it has had no affects.Bolts i have fitted have removed without issue and alloy stays uncorroded.
long teerm affects are unknown but 8 months later and bolts are good and grease still in place.

i have steel rust down here before its outa the packet....

also silicone grease is very cheap.

year ago in the elctrical trade we used Denso paste to stop electrolytic action between dissimilar metals aluminum on to copper bus bars and copper based crimp lugs brass shell clamps etc. Know Land Rover had problems with their new paint plant at Solihull water based paint aluminum and steel causing corrosion around the engine bay probably occurred in other area's where aluminum and steel are in contact but in the engine bay it was easily spotted.they used foam type pads,sealant etc where items were bolted to together

Duralac. Specifically for marine use so will work fine on a Landy. We don't EVER use copperslip for marine use. Can cause serious problems on aluminium.