For years, we’ve used Saran Wrap as a quick-release film for projects involving epoxy, polyesters, and other chemical compounds and adhesives. In general, Saran Wrap is applied to a surface and then held in place with tape, usually of the varnishing variety, and then the epoxy or polyester is squished smoothly against it.
The problem with this approach? Saran Wrap, while great for producing flat, smooth repairs, is rather difficult to deal with during the application phase—it sticks to itself, folds when you don’t want it to, and is very tough to apply to some surfaces. The darn stuff can drive a guy nuts!
Packing tape, we suggest, is much more manageable and just as effective. For example, let’s say you want to fill a small hole in a cored-fiberglass surface. Instead of attempting to immobilize a right-sized piece of Saran Wrap underneath the hole with wide swathes of varnishing tape—an endeavor that is likely to prove frustratingly difficult and perhaps require several wasted pieces of Saran Wrap—we recommend simply sticking a couple of wide pieces of packing tape over the underside of the hole, a way more straightforward, less complicated approach.
Then, after you’ve filled in the hole with epoxy or polyester putty, and the material has cured, you’ll find that removing the packing tape (you just pull it off…zip!) is considerably easier than struggling to remove the varnishing tape/Saran Wrap combo.
But what about the adhesive on the back of the tape, you ask? Well, to be honest, it may make removal slightly more difficult versus Saran Wrap and occasionally small pieces of tape and/or adhesive may stick when you attempt to remove larger pieces. But considering how much easier packing tape is to apply to begin with, a few adhesive issues at project’s end constitute a very small price to pay, especially when the underside surfaces you’re typically dealing with are out of sight most of the time.