The comment that the pitting was not corrosion is false. Pitting is normally caused by galvanic corrosion or in some cases electrolyist. (There is a difference)
Anyway without doing a detailed inspection of the damaged areas to determin the extent and depth of the pits one should not proceed with cosmetic repairs. Most of us as kids stuck Bondo in large holes in our rusted cars and declared that they were restored! LOL
Things to consider.
1. Cause of pitting? If the cause is not treated then the solution will be temp. at best.
2. Large areas? Remove paint, epoxy barrier coat etc back to bare metal. This is an expensive process and soda blasting works well. (They are using it on alluminum houseboats in my area with excellent results)
3. Ok dept pits.. I would consult with an expert on best repair. Small welds on pits usually are very time cosuming and often build up too much heat and warp plates. This area of repair is best left to experts with experience and the right equipment.
4. Minor pitting can be filled with epoxy after proper etching etc. THIS IS NOT BONDO!!.
Often if there is pitting your may find more serious damage around rudder posts and on sharp edges of of the hull, and rudders.
I almost lost a boat once from galvanic corrosion which ate up the metal around a rudder post nearly sinking the boat. (steel Roamer)
After proper repair it is essential there is a complete application of multipule barrier coats prior to bottom paint.
Unless your boat is in a heated area.. this type of repair will have to wait for warmer weather.
dave
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