Patch holes in plastic sheets

I have rainguards underneath the deck, the plastic "wavy" kind of sheets. I had them remounted (they were sagging a little), so now I have holes in them from the old screws.
I'm looking for something to patch these holes. My initial thought was to put some small round (paper) stickers, 1/4" diameter, over the holes, then paint over some sort of epoxy glue that hardens. The stickers are only there to provide a surface for the glue to adhere to.
Any recommendations on what sort of epoxy to get? I need something with a relatively long drying time (30-60 minutes) that applies easily and is very durable.
Thanks.
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snipped-for-privacy@gmail.com wrote:

Clear silicone caulk.
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