Richie C. posted:Using Joe's trick, you can first mix the sawdust with wood glue into a paste and then insert the paste into the gaps and let harden. It can then be sanded smooth. I then cover it with duct tape and haven't had an issue with the tape coming up. The tape comes in different colors and can be painted over, glued and ground cover applied over it.
Yes, this is probably a much better idea. Trying to sand a rock-hard CA glue seam level with a relatively soft substrate like homasote isn't going to end up quite as nice as you might at first believe.
Don't overlook light-weight spackling compound either, it makes a darned decent seam filler. Might even be able to mix with some homasote dust? Regardless, doesn't weigh much, dries fairly quickly, and sands quite easily. Good chance you won't even need to use any tape. 
