The glass will easily withstand the temperature but I believe it has a rubber/neoprene surround which will not. In any case the glass will not survive the grit blasting unless very cleverly masked.
Assuming you are using Aerocoat at St Olaves? They will look after you.
There is also JP Pro-coat in Norwich, run by Jason, a mate of mine. I can give you directions and probably find his phone number if needed.
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