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Lil over 3/16""
Aluminum brazing works well for this type of repair.-----I started using a product like ----LUMIWELD----back around 1980 or so.----And it works well.----Many other brand names out there too.
Here is a recent job on a Johnson 75. Did prop repair too. Basecoat acrylic enamel and topcoat epoxy clear. Beyond factory specs.
Talk to a good welder, they'll tell you it's 50 percent welding and 50 percent "artwork". Nice paint helps the owners "feel comfortable" that what's underneath is gonna work well too. It's not putting a bowtie on a pig, it's more like putting a bowtie on a Playboy bunny. What really counts? The bowtie, or what's underneath it?