Hello Tim, I was initially raising the question in regards to the initial post as to why sheet the wing. I'm assuming that it may be believed that the foam isn't strong enough by itself. I went onto explaining that Phil's covering and methods are quite remarkable as far as weight and strength is concerned. Unfortunately, the SLC covering is only clear. I merely suggested on my latest build using some of Phil's techniques and covering with Econokote that I chose a color. I myself never had this covering turn to goo. In the event your telling me this, it only leads me to believe fuel is seeping under the covering. I do several things to prevent this and it will happen to ALL coverings. I use alcohol prior to finishing all of my seams. Prior to folding the leading edge over or trailing edge, I try not to even touch that area. I use Nelson clear extensively as well on seams, decals, and also leadout exits. Although the product isn't recommended for films, it works for me and I'm pleased with the result. Back to the origin of the post though. I can certainly see the benefit of sheeting the wing for durability. I for one have never sheeted a wing so I was wondering how much of a weight gain is to be expected. I can see sheeting the leading edge would also have a benefit. This however would require cap strips and trailing edge sheeting. Whenever I see this being done, epoxy being used sparingly is typically the glue of choice. Does this put the weight back on as well? I look at foam wings generally as a expendable item. In the event all this was to be done, is it just as easy to build the wing traditionally? I do however feel the results from sheeting parts of the wing would look terrific. We have one member in our club with a particular wing as described above. The wing is actually silkspanned and doped. Is this the other benefit of sheeting the wing? I would imagine one would have to be quite careful initially using light coats of dope until the silkspan is sealed. Ken