alt. to resin 4 smooth glass look

I concur....

But at any rate, like Velocity said, time is of the essence, especially when  you are being paid. If consistency is big, there are many ways to change the consistency of resin-based products (fillers etc.) to make it easier to spread and/or self leveling. You can use anything from heavy filler (thick) to MEK thinned resin (i wouldnt thin it too much though) to make your finished surface, and chances are it will be a hell of a lot stronger than glue. Resin is used because it is relatively solid, and very rigid. heat wont make it soften. And i'll admit i have never tried the glue method, but i dont see glue as being a solid, stationary material. There are just so many different options that are resin based and tough, that using something soft like elmers glue doesnt seem like it would be the most time-effective approach.

In my last project, i used all sorts of filler/resin mixtures for different applications. One of my magic mixes was pretty much the consistency of high build primer, and it took little sanding to complete. im not knocking your methods, but when i think of something thats going in a moving vehicle, i tend to lean more on the side of rigidity and solid adhesion.

So do whatever works for you, we're not insulting you here, just trying to give you some perspective from our own experiences.

Yea, and I once chewed a whole pack of gum and used it to stop the rattles in my door panels, but that does not make it a legitimate method for stopping rattles. 

Juicy Fruit works better than Big Red, by the way.