Ken;
No one seems to want to respond to your query!
For "soft areas" where you suspect leakage or a low area where water puddles and will not run off the roof, I have used Kool Seal white acrylic Patching Cement. It comes out like mayonnaise and can be putty-knifed on the roof reasonably thick. It is self leveling as it dries so that brush strokes level out.
For general resurfacing I used Kool Seal white Elastomeric Roof Coating. It is more like paint and is applied with a brush in the usual manner.
Both of these products are available at Lowes/Home Depot. Wait until it warms up to apply and scrub clean the roof and allow to dry before application. They cost about $10.
Let me know how you make out.
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