I need some sticky stuff (treated/unpainted wood to powder
coated metal, little shear/peel force, exterior use and will
have some exposure to rain/dew, no direct sunlight)

My first inclination is to get out the power tools, drill
through the p/c steel and screw it to the woodwork. Although
this is complicated, since the steel is in place, so it's
difficult to get screws through the steel, into the woodwork.
The work also has to be done up a ladder, so dismantling and
acrobatics are not possible.

However I'm aware of all these "new fangled" adhesives and
wonder if any of them are up to the job. There won't be any
load-bearing, just supporting the wooden panels at the top.
Their weight is suppported by what they are resting on.

Looking at the toolstation catalog, they have a plethora
of offerings, in price order:

Glue Screws - solvent free (their own brand)
Glue Screws - solvent based
Gripfill *
Pinkgrip
Gripfill solvent free **
Pinkgrip solvent free **
Stixall M.S. polymer
Sticks Like

* the only one that explicitly mentions exterior use
** specifies interior use only

The question is: which one to use. I don't want to have
to go back and redo the work for at least 10 years, yet
apart from the superlatives that make up the descriptions
of each product, there's little to say which ones are
better or worse - or more/less suitable for my task.

So, which ones do you use?
War staories about exceptional performance (either good
or bad) appreciated.

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