You might try pushing on the valves in the bottom of the tanks with a stirring stick before each use. I've found they tended to stick a bit, but that was using Safetypoxy. If fluids have a hard time flowing from the tanks the plungers will take longer to refill. Push straight down on the valve stem. I used to stir each tank as well to make sure any heavy components were evenly distributed. I also periodically checked the pump ratio.  -Bill Wade

---- Will Holden <w.holden@insightbb.com> wrote:
> I have a Michael Engineering Sticky Stuff Dispenser.  I bought it used in pretty good shape.  I cleaned it up and all, but I am having trouble with it.  When I pull the plunger down, it goes, but it does not go up easily.  Do I need to unscrew the pump parts where the cylinders are and soak those in acetone or denatured alcohol?  I bought new reservoirs, but what is included in the rebuild kits Aircraft Spruce sells?  Has anyone ever send one back to Michael to get it reman-ed or should I just buy a new one?  Thanks!
>
> Will