I've got a naked frame here

(well, soon to have) so I thought I'd take advantage of this (

) and make a nice job of it. I also have a munted frame (

x2) which I also want to sandblast, but only cos it's gonna be ma new table.
What I want to know is, by sandblasting the frame (and swing arm), will this weaken the frame at all, and if so, by how much? It just looks a bit dull, so since there's nothing on it, I want to freshen it up while there's the chance..
also, any recommendations for places to do this? and how much/long?
And if it's lookin to be a nope, then could anyone suggest anything to make it nice again?
aaaaaaaaaaaaaaaand, does anyone know the name and number of that place in Cambridge that checks frames for straightness?
ta peeps

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