I bought a clear fiber re-inforced tarp, for greenhouse covering a few years ago. I gave it to my neighbor last year. I figured I won't need it when my HFGH is installed. I now think that adding this clear (rip resistant) tarp to the outside of my HFGH will help keep the HFGH warmer, and prevent the panels (although soon will be silicone re-inforced) from being blown loose. I can't remember where I got it originally. I would feel funny asking for it back. I will be web searching for it, but if anyone has an idea who sells it, please mention it.