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I don't see an issue as long as you scrubbed it out with soapy water and a tooth brush, rag.
Glass grit breaks down upon impact and to a small extent embeds itself on the surface of the soft aluminum. Aluminum looks clean after blasting when in fact all you see is a uniform surface, but it's actually contaminated with glass particulate.
On items similar to a T-stat housing I pack paper towel into ports then tape the heck out of them. Blow it off, remove the tape and packing then scrub the device out. You will see some grit stuck to the edge of tape residue. Brake clean or solvent... before washing. Simply be thorough.
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