If you don't want to get it welded, but want to keep water and dirt out, just get a can of GREAT STUFF expanding foam and fill in the gap. I cut through some of my seams on purpose and I just filled the gaps with that stuff and I've had no problems with debris getting inside.
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If you light a fire for a man you'll keep him warm for a day, but if you light a man on fire, you'll keep him warm for the rest of his life!
I ♥ Transitive Pictograph Verbalizations