I wonder if you can paint it. Or...better yet, check with the companies that sell them and find out if they come with a white or a silver side. I know you can buy heavy duty tarps from Home Despot that are brown on one side and silver on the other... Maybe there are such tarps for pool covers also? I really don't know, have never had the need to investigate....but for you southern guys it might be worth the hunt.
If it were canvas then I'd say to paint it with Fabspray. I've used that stuff on car seats and it works really, really well.. but that's for fabric... not sure how (or if) it would work on plastic...especially poly... 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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