That method won't work very long at all,plus it'll look crappy.
But there is a panel adhesive that would work well and being used alot in where folks have no welders or the required expereince to use one...
Here's the 3M panel adhesive,when these panel adhesives are used accordingly,they can be near as strong as a weld,follow the directions STRICTLY...you will also have to buy the gun to use....this stuff is a great alternative to welding non structural panels on a vehicle,it's been widely used in replacement panels and floor work in resto's and repairs.
You can also stop at your local auto body supply store and they will commonly have this on the shelf or the same adhesive but other brands....
3M 08115 Panel Bonding Adhesive
This is another one that some people say is better than 3M and commonly found at stores too...i've never used it,but have used the 3M and happy with it..
Products: FU110B - Fusor Metal Patch Panel Adhesive Bondline Control (Fast-Set) 7.6 oz., 6 case/qty.
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