When I wanted to transfer a drawing to an already partially painted surface, I first covered the existing surface with a coat of Golden Fluid matte Medium. This would dry quickly. I then used tracing paper to transfer the image, and then sealed the transfer with another layer of Fluid Matte Medium. I could then paint over the sketch which always seemed to involve many deviations from the sketch. I would make sure that the matte surface was completely covered with a same underlying paint to fully restore the normal gloss finish of the painting (This was easy to do in that my pallet always contained a color pool for all of the colors that had been used in the painting up to that time!). This process was used to transfer a sketch for the car and lettering for example.
The lettering, however, involved another challenge. As you can really almost see in the photo above, I wanted the letters to have a textured, spooky shape and surface. Transferring the sketched letters merely solved the spacial placement issues.
To get these brilliant colored letters over a previously painted surface was also a challenge in that the colors on my modern pallet, with the exception of titanium white and carbon black, are relatively transparent. To get around this issue and to create the bumpy surface and outlines that I wanted, I devised the following technique. First I mixed my OPEN titanium white with Golden Polymer Medium (Gloss), which is a fast drying regular acrylic medium. The resulting white mixture had body and would dry quickly. I then applied this mixture with a small flat brush to squiggle and lump the shapes of my letters over my linear transferred sketch. These white letters dried quickly so that I could go right ahead with the letter coloring.
At this point I had great lumpy, spooky white lettering. I would then glaze the final relatively transparent colors heavily over the white base. This was done for both the yellow and red lettering that you can see above. Note that heavily glazing the transparent colors over the white base results in the rich and brilliant spooky lettering that I was told by my son that he had to have! He's a tough customer!
The reason that I am describing this process is to illustrate how the Golden OPEN Acrylics, when combined with the appropriate mediums, is an extremely flexible medium with respect to properties such as drying time, body, and transparency. It just takes imagination on how to combine these great products!