Blue Devil head gasket sealer bad results?

I am at my wits ends here. My 2003 honda civic was overheating, after an hour or so. I had ASE master techs inspect it and they all determined it to be a head gasket issue. They quoted me at 1200+ for the job. I foolish chose to try blue devil and now my car is even worse. After I followed the directions I see white chunks in my radiator. And when I go to drive it it overheats within a few minutes. I can't believe I did this… Please help is there any way I can fix this or at least bring it back to the way it was before blue devil? Like flushing the system. I am guessing that the blue devil has gummed up the works and now the coolant can probably circulate so it just overheats and steams off.

Please any and all advice are appreciated.

Read more: Blue Devil head gasket sealer bad results?