LOL!
I use small dots of elmer`s glue on any kind of paper, wood, cloth or metal. Pale
flowers will show the dots of glue if you put them on darker surfaces.
You can use clear contact paper to cover the
flowers on the paper, a thin coat of elmer`s glue mixed with a bit of water, hair spray (my favorite), put adhesive on tissue paper and put that over the
flower (another favorite) or fine netting or toile sprayed with adhesive.
The metal and wood projects reguir a stronger coating of clear whatever depending how sturdy you want the piece. I have used the stuff you mix together right before you put it on and it has held up on a tray very well.
The most important thing to remember is that UV rays even from a light bulb will fade the
flowers.
I don`t use any dyes or paints on mine, some people do. I like the more muted natural colors.