I have a super gutter that is made of asphalt. The length of this gutter is
about 35 feet and there is a drain to a downsprout below at one end. The
gutter is not sloped steep enough and there are a couple of "dips" along the
way that mades puddles.

I would like to recoat the gutter with some elastomeric coating, but I am
trying to think of a way to see if I can "build up" one side of it and
reshape the slope to make it smoother and steeper. I cannot think of a way
to do that. I know there are rubberdized compound I can use to fill in the
puddles, but I cannot think of a way to reshape the slope of the gutter.

The only think I can think of is to apply the coating gradually and
progressively. If I apply a complete coat first time, then from the drain I
back of 1 foot, apply another coat from there to the beginning of the
gutter, then back off another feet and repeat, then by the end I would have
35 coats on one end and one coat on the other. That would be very time
consuming and extremely costly. Any thoughts and ideas?

Thanks in advance,

MC

 

Here is a pic if this help visualize things.

MC

 

If I understand your situation right, just use epdm roof membrane. Apply the adhesive on both surfaces and install. Pre cut and dry fit first. It won't matter on the standing water. If you want you could build up the low spots then install the membrane over it.

 

Seems I posted links to pics but they did not show up?

http://i173.photobucket.com/albums/w67/143house/gutter/P1000991.jpg

http://i173.photobucket.com/albums/w67/143house/gutter/P1000997.jpg

http://i173.photobucket.com/albums/w67/143house/gutter/P1000994.jpg

MC