Clecos are one of the coolest inventions ever, and do work good on mocking up pieces and holding them for glue to dry. They also won't distort the panel like a screw that is in too tight. But for the price screws are hard to beat. Make sure that after you are done you pull all the screws out and fill the holes with glue, don't weld the holes it will heat the surrounding glue too much and it will let go. Also when you are finished put a light coat of Evercoat "Kitty Hair" or equal product around the entire glued area, if there are and voids or air pockets in the glue this will stop moisture from coming through unlike normal plastic body filler. good luck with your install, gluing is one of the slickest methods i've tried so far.
A buddy helped/taught me some things on sheet metal work. We used adhesive on my trunk replacement. He showed me using rivets. Once the glue sets up just grind off the heads. Then there's no need for filler. Lightly grind off though, don't let the metal get hot. Overheating the panel and glue will cause the glue to release, as mentioned above.
I will always use glue where I can. I am very satisified with the results.
clecos were invented i think for aircraft skins (i used to be an aircraft mechanic) and there great on aluminum. the rivets are aluminum also. good for grinding them off. or drilling them off (aircraft rivets have a divet in the head for drilling off). cool little things...
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