Go for it.. I picked up a Blaster for my wife for $100 due to a blown out crankcase... I tig welded it and it came out great!  CLEAN CLEAN CLEAN.. . flush with copious amounts of acetone.. clean some more all with stainless brushes.... get a good root pass, set balance for cleaning and let the puddle dwell to cook some of the crap off..   you can do it!