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Hi,
Go to your local hardware store and tell them you want to seal some
slightly dry rotted wood.  They should have something there that would
work if they don't have the PolyAll.  If it's not bad just using some
clear polyurethane and letting it soak in and dry should do it.

What is used to glue down the roof is a WATER based adhesive.  Dicor of
course sells it but you may be able to find a water based adhesive at
your local hardware store or Lowe's or Home Depot or your local RV
dealer.  Just make sure it's water based and not petroleum or solvent
based.  Around a joint or seam it is probably a good idea to get the
roofing glued back down if you can.  That would help keep any water that
might find it's way in from running under the rubber roof.  It will make
putting down the Eternabond easier too if the roofing can't move.

What the picture looks like to me is the back part of the RV and you
have removed the seam moulding where the rubber roof and aluminum come
together.  Usually the rubber roof comes at least right up to the
aluminum, but sometimes they don't cut it right and there is a space.
As long as the seam moulding covers both the aluminum and rubber roof it
should be ok.  Some sealant is laid down on the joint  and the seam
moulding  is put over the joint and screwed down.  The screws and edges
of the seam are then usually sealed with self leveling sealant.

There are two ways of doing it.  Put the seam moulding back down across
the joint using sealant then seal the screws and along the edges with
self leveling sealant then put the Eternabond over it.  Or put the
Eternabond down first over the joint then put the seam moulding back
down and seal the screws with self leveling sealant.

If it were mine and I wanted to get it back to as close to original as
possible but wanted to make sure that joint never leaked I would put the
Eternabond down first.  Cut the Eternabond to fit around the seam with
the screw you are talking about.  Make sure it goes over the edges and
covers the plywood down to the awning rail.  Then put the seam moulding
back the way it was over the Eternabond screw it down and seal the screw
heads on the seam moulding and even along the edges if you want.  Seal
around that screw and edge moulding you are talking about with self
leveling sealant and where the Eternabond goes over the edges to the
awning rail.

As long as you are up there you might want to think about doing a close
inspection of all the seams and if you find any loose or hard sealant
replacing it.  I check all the seams once in the spring and again in the
fall.  It doesn't take much to cause big problems.  I don't know if you
know this or not but if you keep your rubber roof clean it will cut down
on the black streaks down the sides.  If you keep the RV waxed it will
make getting rid of the black streaks even easier.

Hope this helps.  Take care and Happy Campin...