You're not going to find any 500 foot rolls of 6 millimeter plastic! There is a mistake there. I think he means 6 mil plastic. As in 0.006-inch thick.

You can get 10x100 ft rolls of that at Home Depot for $60 or so. It's standard "greenhouse" film. Probably would last a few years exposed to the UV from the sun.

Be careful though. Such plastic sheet is degraded if it comes in direct contact with PVC, so the PVC ought to be wrapped with something where it touches the plastic sheet. I'm surprised that the A&M person didn't understand that!

Here is a link that might be useful: don't let PVC touch polyethylene plastic sheets

P.S. No, those rolls at Home Depot aren't perforated. Not sure where you'd get the perforated stuff, or what it is for.

Thanks for the information Dan.

Theoretically, you could use a small drill bit to make the perforations 4 inches apart in two straight lines on either side of the roll. Unless you can find it at a growers supply, anyway.

The article is describing a perforated/vented hoop house. It could work!

I always like a non plastic cover...don't really know why, I've always done it that way.

From the lastest issue of Texas Gardeners Seeds:

"Where in south Texas can you find the plastic described in the newsletter ('Easy, affordable cover extends growing season in home gardens,' Seeds, December 31, 2014)?" asks Don Skow.

"Joe Masabni ordered that plastic from Agricultural Solutions online at:

www.agriculturalsolutions.com.

"He bought a 6' by 500' roll for about $90."

Here is a link that might be useful: Jan. 7, 2015 issue Texas Gardener's Seeds

Maybe they meant www.agriculturesolutions.com instead? The other site seems to be an Australian site. The link below is a list of perforated plastic film products.

I use frost blankets that I've gotten from Natural Gardener in Austin and have had good success with them. Here's a link to those: http://www.agriculturesolutions.com/products/agricultural-fabrics/frost-protection-blankets/agribon-frost-blankets

Here is a link that might be useful: Perforated plastic products

Is there a reasonable way to cover a 4' bed with a 6' plastic without harming your plants? The article says " ...he bends a PVC pipe..." A 10' pipe is ok to make an arc...
Maybe he uses two 6' wide pieces of plastic to cover a 4' wide bed???