none of these coatings mentioned is weldable right?

I guess you could use a weld thru coating first, then spray/roll something else on after.



the whole thing is overkill for what your doing, you might be looking too much into this

So a little update. Took out the power steering so I would have space to work on this rust problem and move the engine harness out of the way. Took me about an hour to take out the power steering pump which I had never done.



I started tackling the rust by cutting the jagged edge out... here are some pics.



I found some 1/16" hot rolled sheet metal, but I'm thinking that might be too thick. Should I cut deeper? (ie cut the hole out bigger still?)