Most experienced do-it-yourself boat owners have likely run in to issues with galvanic corrosion. Also known as dissimilar metal corrosion, galvanic corrosion occurs when two or more metals in contact which each other oxidize and corrode.
The obvious way to avoid galvanic corrosion is to avoid adjoining dissimilar metals when possible. While this is great in theory, it frequently is not the practical option. Often different component parts are most easily fabricated from different metals. For example, door frames are generally manufactured from aluminum extrusion while fasteners, hinges & latches are often stainless steel. Price and availability of materials often force boaters to find an alternative solution.
With 30+ years in the business of building boat parts, the best alternative solution we have found is Tef-Gel Corrosion Eliminator.
In the last 10+ years, we have shipped over 10,000 framed doors with stainless steel screws fastened in to aluminum powder coated frames. Every aluminum framed door we fabricated gets Tef-Gel on all stainless steel screws.
We simply have not had any significant warranty issues due to galvanic corrosion. We have had well less than a 1% return rate and these doors are used on thousands of boats worldwide.
How to use Tef-Gel:
To apply Tef-Gel, simply add a small dab on to the mounting hole before you apply the dissimilar fastener. Tef-Gel acts as a buffer between the two materials helping to avoid corrosion and costly repairs. Besides helping to prevent galvanic corrosion, Tef-Gel also helps prevent seizing and galling of metals. This is critical for any applications that might require disassembly or removing screws & bolts in the future.