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Dwg86
I’m working on a Jeep Wrangler that I cut in half to make a truck. I’ll post some pics.I figured you might find a spot that could benefit from some urethane caulk. I didn't mention a brand because some of the products I have access to at my day job are sold at commercial building industry supply places. Commercial caulks are far different now than home crap most are used to seeing. One we recently started using, Dymonic 100 is similar to windshield urethane in strength. I have used actual windshield urethane caulk for similar use before. You may get this much cheaper from a glass shop than the 20 something bucks I've seen it at in auto parts stores. Anything I've ever used seemed way better than the cheap crap factories used years ago.
You just want some flexibility along with strength. Not sure what products the auto paint stores may have, I've always used what I have available if possible. You could even use the orange fire retardant spray foams to stiffen between braces & metal, trim back after a few hours & run a seam over it. I have the professional guns for the large cans, which are controllable & tightening the flow knob will keep unused portion good for months.
Sanding hoods flat, or to the proper curvatures should I say, is one of the most difficult areas in some cases to bodywork to perfection. If you can easily get some more support from the inner structure, it will save you some grief, particularly on a large hood without many defined body lines.
By the way, what hood are you working on? More details as to what you're working on can improve what answers you get on a forum. Sometimes the best answer you get may not be exactly what you asked for.