The ingredients in Modge Podge are not the same as a typical craft glue. Special ingredients are added for enhancing the durability thereby making it suitable for long lasting projects.
You can apply 2 or more coats depending on the effect you are looking for. The more the number of coats are, the softer the effect is.
Fevicryl Mod Podge is uniquely formulated in such a way that it can be used on MDF, Wood, Glass, Metal, Fabric etc one can avoid using it on Ceramics, Plastics and other products which comes in contact with water.
Decoupage directly on walls is not recommended as the wall surface differs.
Recommended papers are decoupage tissues, decoupage papers, Newspaper cut-outs, Rice paper, magazine paper, packing paper, scrapbook paper and more.
Try applying decoupage glue with a flat brush and soft hand. Apply glue more than 2 times. Secondly use a sponge or a sponge applicator to apply decoupage glue to minimise brush strokes.
One can use a blow dryer ( Mild / moderate hot setting mode ) to speed up the drying process. Drying depends on how thick the application is. Thicker layer of application / deposition will take more time for drying.
While doing decoupage tear the edges rather than cutting them. Paste the paper and then use a sharp cutter to cut the extra paper over the edge. Or use sand paper to merge the paper with the surface using glue or paint.
Once cured, it can withstand gentle cleaning done with mild soap & water however It's not totally waterproof. It should not come in continuous contact with water. Outdoor exposure, harsh washing / cleaning with sharp objects & scrubbing should be avoided.
It is EN 71 , Part III Compliant product. Direct contact with food items / eatables should be avoided.
Curing time depends on deposition / thickness of the coating. Normal drying time is 15-20 minutes between the coats.
One can apply a clear matt varnish or spray for the same.
Yellowing over a period is not expected if the project is well preserved indoors.