I think you may be misinterpreting your results, Anthony.
I wonder why you have to continually re-shrink your Solartex. I have not experienced that problem. I do use hair spray as an adhesion enhancer, however.
In my opinion, the silver is unnecessary. It was originally designed to prevent UV rays from deteriorating the fabric. Since our models aren't subject to the same weather rigors as the full size, it doesn't need to be used.
I agree with the transparency of the colored Solartex. I wouldn't use it. A model, covered in Natural Solartex and properly painted will not have these issues.
The weight thing is another matter. I'm not a weight watcher. LOL I do feel that if you are going to compare Solartex to the Stitts System, for weight, you have to use painted Natural Solartex.
Both products work well in my opinion. They both look good when finished. I do feel that Solartex is less effort, however.
To make it clear, my remarks are for Natural Solartex and paint, not the pre-colored Solartex.