Thread: Sealants.

Another vote for 3bond

I've used Loctite 515 for about 15 years and it's pretty good and a plus is that I can actually buy it up here. Recently I've started using Hylomar Blue as it's good with oils and disassembles easily - but had a huge problem when coolant leaked out of a V8 timing cover. I got in touch with Hylomar and they admitted that it isn't really meant for coolant. (It would have been nice to put that on the tube, then.) Hylomar silicone did the job for that when I reassembled it. Apparently silicones are the best for coolant.

Originally Posted by uninformed

Generally there isn't 1 product that will do it all and at best practice. Just pick a known brand like loctite or permatex, that is convenient to you, go through their product guide and use what is best suited to the application. The colours are not there for looks, but to identify the product type within a given brand. I'd pick performance over colour every time. Sticking to one brand will prevent confusion, as competing brands have same colour with different specifications. Also you may choose to stick with one type of sealant ie anerobic etc

Indeed, but there is an interesting trend with the grey sealants mentioned so far. Permatex, CRC and whatever Nissan use. All of them harden a lot more than your average RTV silicone. The nissan stuff is cured close to bitumen in hardness. Which is probably what I need.

Originally Posted by Dougal

Indeed, but there is an interesting trend with the grey sealants mentioned so far. Permatex, CRC and whatever Nissan use. All of them harden a lot more than your average RTV silicone. The nissan stuff is cured close to bitumen in hardness. Which is probably what I need.

http://www.permatex.com/products/Aut...sket_Maker.htm

the key words here are "maximum vibration resistance"......can anyone say Isuzu. When I looked at using either the blue or black in permatex, for my lt230 sump, I found the black to have a slightly higher oil resistance and a faster curing time, so thats what i went for. But in Loctite, there are different differences between their blue and black. So I still stand by my previous post.

x3 for 3Bond.

We get it thru Honda at dealer prices .... it's good stuff !

my 3 favourite sealants, in no particular order

Holden Head Stud Sealer - anywhere where a bolt/stud goes into a water gallery
Three-Bond grey - Holden part number M40510 - use anywhere where you would use a silicone type liquid gasket, around $45 for a 250g tube, exxy but more than twice the size of a regular tube
Permatex - anywhere where you would use a normal gasket in addition to the gasket

Originally Posted by Davo

I've used Loctite 515 for about 15 years and it's pretty good and a plus is that I can actually buy it up here. Recently I've started using Hylomar Blue as it's good with oils and disassembles easily - but had a huge problem when coolant leaked out of a V8 timing cover. I got in touch with Hylomar and they admitted that it isn't really meant for coolant. (It would have been nice to put that on the tube, then.) Hylomar silicone did the job for that when I reassembled it. Apparently silicones are the best for coolant.

Ditto re Loctite anaerobic sealants although I usually use 518 or 510 as Davo does.

I also fekked up using spray on Hylomar on my 300Tdi P gasket.
I thought the 518 might be too rigid between the cast iron and aluminium castings.

I love Hylomar spray for oil but won't make the coolant mistake again either.
I thought it might be the 2-HEA used in some OAT coolants (Caltex) as they soften some elastomer's.
Maybe it's just not suitable for coolants, full stop.

Originally Posted by Sprint

my 3 favourite sealants, in no particular order..........................Permatex - anywhere where you would use a normal gasket in addition to the gasket

As you know, Permatex is a brand, with many different types of sealants for different aplications...And If you mean RTV silicons, then why include the gasket? to me it is just 2 more surfaces that could fail.

IMO paper (of any kind, thickness) should only be used on flat surfaces. Ive seen thicker paper type provided with alloy surfaces with a ridge. This is a potential area of faliure due to the ridge cutting the gasket. I have thrown the gasket and just used Permatex ultra Black.