Patching corrosion holes

[sinned]

Greetings all-

I need to patch some thru-holes in an aluminum hull that has lapstrake creases in it.

I am dealing with 2 thru-holes and a hole created by corrosion crated by mouse nest / mouse pee combined with a broken box of caustic marine toilet additive. Boat was a barn find, stored for 20 years. Picture attached.

Ther stair step of the laptrake effect is what has me concerned.

After reading threads here, my options seem to be sandwiching it in riveted aluminum plates with penty of 5200 type or JB Weld, or something like West 650 Toughened flexible epoxy and fiberglass.

I am thnking that I would clean, prime/prep and spot the pitting on the inside with JB Weld.

An other thought would be to use a thicker plate and inject the epocy under pressure with a zerx fitting and grease gun like we use for concrete.

Can anyone comment on the long-term performance of what they did for similar repairs to help me make my decisions?

thanks

Dennis

 

[LDUBS]

Not sure how big holes you are dealing with. I've seen guys use a square piece of aluminum patch on the outside. Butter it with 5200 then cover the hole(s). Use pop rivets to hold it on.

 

[sinned]

I am leaning towards G/Flrext instead of 5200. I have see too many threads that talk about long term problems with 5200 and moisture intrusion.

 

[oilsmoke]

I patched up a corroded mess of a jon boat some years ago, the thing had sat on a couple bails of hay for years full of bird droppings. I lightly spot blasted the corroded areas and then filled them with JB Weld. It had close to a 100 pits and holes that had to be filled. I finished it up with a coat of Gluvit on the inside a couple coats of paint.
I used Jb Weld because its what I had but I'd venture to guess that PC7 or Marine Tex would work just as well. I had that boat for 15 or so years before selling it to a buddy who still uses it.