if all you are wanting is to make them non accessible open them and glue them shut with liqiud nails Fuse it Siliprene or some other super high strength adhesive however if they are fiberglass that will not keep some one from sticking their foot through it and gaining entry then you need to remove cover and replace with sheet metal. Gene
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Its hard to be wrong when you live in Wright City!
There is no mechanical problem that cannot be overcome by a skillfully applied combination of brute force and ignorance!
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