Which sealant/adhesive is best ?

[intrepidvoyager]

Re: Which sealant/adhesive is best ?

Hey Dakine,

thanks for this ...makes sense to me ...i don't want to make a big issue out of the molecular properties of certain silicones but .. any worries about the following article ?? .....

> I'd speculate that the earlier formulations > (sometimes?) contained too much free acid, which was > left behind to cause corrosion. The main mechanism for > corrosion is probably electrolysis of dissimilar > metals, which would be accelerated by the presence of > acetate ions. > Please can we re-state the question: Does anyone have > experience of corrosion caused by MODERN silicones? Certainly. The corrosion is entirely dependent on the particular type of silicone sealant used, and most common ones generally available to the public still release acetic acid when curing.

I realize that silicone sealant is not grease .....but what about acetate ions ?

i am always interested in learning something new .

 

[dakine]

Re: Which sealant/adhesive is best ?

One component silicone rubber formulations, those known as RTV or Room Temperature Vulcanizing formulations, contain chemicals that turn into acetic acid as the rubber cures. This can cause corrosion.

Two component silicone rubber formulations use different cureing technology and don't have this problem.

Silicone grease does not cure, does not contain these acidic components and is about as inert as anything but teflon.

Packing metal stuff with grease to prevent corrosion is as old a trick as caulking clipper ships seams with flax, oakum, tar and bull semen.

 

[flyer4ever]

Re: Which sealant/adhesive is best ?

Sounds like a plan, I will borrow the iboats corperate jet that we moderators use at times, and fly over in the morning .............. Oh, wait, you haven't got the boat finished yet. Oh well, guess it will have to wait. Bummer.

Hey Don, How do you rate a jet? If I bring the glue, can I go To?

 

[intrepidvoyager]

Re: Which sealant/adhesive is best ?

OK .....Great ...... We'll get on up to the local ranch this morning.