Water-based size is used for gilding the surfaces of objects with medium porosity (such as wood, plaster, stucco, paper and cardboard) that will go indoors. It is particularly suitable for:
• Wood frames
• Paper and cardboard
• Wood furniture
• Wood coverings
Use water-based size to apply both pure gold and silver, loose or transfer leaf. In the latter case, using a sheet of tissue paper will facilitate grip and application, speeding up and simplifying the gilding process.
For imitation leaf gilding you will find more information here