Shop is in Alma, normally do great work. I pulled boat 150 miles for them to work on it. The bill was only $288, you were close. The son did this last job and have used his dad before and hope this was just a fluke. I sent them a pic and let them know what was causing problem so they could look for that in future. Told his momma and that will probably fix the problem. The pic doesn't really show the stuff clearly, it is almost like small granular plastic sand. Got me puzzled.