clean the old adhesive off and clean glass and brackets with surgical spirit or lighter fluid.You can then use dow corning silicon as it withstands heat or if you want to use a product designed for the job copy and paste this in to search engine
http://www.absealants.co.uk/product_10-2-_High-Temperature-Resistant-Silicone---Oven-Door-Sealant-Repair.htm
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December 2010