I was worried about blasting the thin tubing, so I went to the trouble of chemical stripping. Then the guy told me he was going to lightly blast it anyway - he called it "dusting" to make sure he had a thoroughly clean surface for the bond.

If you have any doubts about their experience with bikes, make sure you put bolts in eyelets, bottle bosses, etc. and tape off the crown race and BB threads. A good shop with experience will probably do this stuff for you.