I have a couple of similar repairs to undertake on my replacement station wagon tub. My plan was to use tigerseal (or sikaflex, i am not brand loyal!) to glue the repair plate in place along with some rivets. I am not trying to achieve a perfect finish so am not trying to make invisible repairs. I have a large sheets of 3mm ali to cut the relevant parts from, but have the bottom edge simialr to you, and some parts of the wheels box to do.
Actually PU adhesive would probably be fine, in conjunction with rivets, being non structural. 2 pack panel glue is more for structural areas.
 
I have a couple of similar repairs to undertake on my replacement station wagon tub. My plan was to use tigerseal (or sikaflex, i am not brand loyal!) to glue the repair plate in place along with some rivets. I am not trying to achieve a perfect finish so am not trying to make invisible repairs. I have a large sheets of 3mm ali to cut the relevant parts from, but have the bottom edge simialr to you, and some parts of the wheels box to do.
My father in law used to build horseboxes and he swore by TigerSeal for all sorts. I used the Sika version when I resealed the sunroofs on my disco, and they’re not coming back out in a hurry that’s for sure !!
 
My father in law used to build horseboxes and he swore by TigerSeal for all sorts. I used the Sika version when I resealed the sunroofs on my disco, and they’re not coming back out in a hurry that’s for sure !!
They are essentially the same as windscreen adhesive, so pretty robust.
 

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