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Well as previously stated, skimmed the boiler first. Then I got around to installing clevis hangers, pitching, and insulating all pipes after the asbestos removal, atleast for the most part. Couple really small spots open due to fitment issues with other pipes. Drained the boiler and used water wand to clean inside until all water ran clear, added new sight glass, and a switched to straight pig tail from the horizontal one. Added rectorseal surgemaster, started up green, then turned red after boiler shut down and water ran back to boiler indicating the rectorseal didnt compelte its job. Still was getting surging that pulled all water out of sight glass. Surgemaster instructions state to use a second bottle, then drain if that doesnt work. I am thinking I need to skim again first. Then try another bottle before draining. I have a feeling that the water turning red is due to 9 of my 10 radiators being dipped, sandblasted, and repainted this summer and that residue is coming back to the boiler so this could be ongoing. The first radiator on the main line is the only one where the vent is getting clogged with water which sucks because the thermostat is in that room. I'm hoping this clears up with skimming and maybe another drain and fill. From a previous post I realize that the near boiler piping is about a half inch too small (2 inch vs manufacturer recommendation of 2 1/2). I'm hoping this isnt the reason it keeps surging. I dont mind getting the piping corrected but it needs to wait until after winter.