Fishing holders in aluminum boat

 Hi tthere can anyone gives me some advice on installing fishing rod holders in my ali dinghy to the top plate near my stern rails.

when I cut the hole with a hole saw, do I need to cover the exposed aliminium up with any product to stop it from rusting at all?

also same as screwing a marine floor into the bottom of the boat, do I need I use special screws?? 


RobertMc's picture

Posts: 325

Date Joined: 19/01/09

 Mate I'm pretty sure Ali

Sat, 2013-01-26 16:44

 Mate I'm pretty sure Ali doesn't rust, so you don't have to cover any exposed Ali up, and as for screws you would have to use stainless steel so they don't rust and break.

Posts: 3

Date Joined: 06/01/13

 Thanks for your help, is

Sat, 2013-01-26 16:47

 Thanks for your help, is there anything else I need to look out for? 

opsrey's picture

Posts: 1199

Date Joined: 05/10/07

Dissimilar metal.

Sat, 2013-01-26 17:29

 When using Stainless screws or bolts/nuts try to use a protective barrier between the Alie and stainless. Dissimilar metal ion exchange (galvanic reaction) is a big issue with Alie made anything. Don't leave metal things lying in the bottom of your tinnie, pick up swivels and hooks etc, otherwise you will set up a galvanic reaction where the Alie gives electrons and makes white powder.

you might use some yellow coloured caulking material purpose made for role or some plistic shims or washers to insulate the head and nut from the Alie.

 

on a technical note, Alie does rust. What makes it useful is the rust layer Alie Oxide prevents oxygen coming into contact with the raw Alie so the rusting process stops very quickly. Raw Alie is bright silver in colour, Alie with the oxide coating is dull grey.

 

Good luck.

big john's picture

Posts: 8388

Date Joined: 20/07/06

Duralac

Sat, 2013-01-26 17:30

See if you can get some duralac to coat the stainless steel screw threads in before screwing them into the aluminium. This will prevent electrolysis occuring between the two different metals.

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dagree's picture

Posts: 660

Date Joined: 08/12/07

Duralac +1

Sat, 2013-01-26 17:51

Magrip,

osprey and big john have given you all the info you need.

If you want some Duralac, and live or can make it NOR, I have tube that I could squeeze some into a container if you want some... Don't need a lot to cover a few screws and will save you a few $'s.

Send me a PM and I'll pass on contact details if you're interested.

Cheers,

Dave

____________________________________________________________________________

Cheers,

David (AKA Grumps)

Location: Heathridge.  Toys:  120 Series Prado ... 5.3 Stacer Seamaster/Merc 90HP.

Posts: 3

Date Joined: 06/01/13

 Thanks for your help guys

Sat, 2013-01-26 18:58

 Thanks for your help guys