I think everyone employs a different method when working around their flocking, I think it's something that has to be played with until you finally decide which method to use.
First, I like using Elmer's white glue slightly thinned down with a bit of water, I personally think the Elmer's glue is a little too thick right out of the bottle. I usually like using embossing powders to do this instead but I do employ the same thinning technique as I do for the flocking. Make sure you use a small strainer, you want the flocking sparsed and evenly distributed throughout the area. Once you place the flocking inside the strainer, tap it and let the flocking do it's job.
Work one area at a time, don't try to do the whole interior floor at once. I like to start on the transmission hump first and work myself towards the outside. Make sure to dump all the flocking you can, the more you dump, the better, the weight of the floccking should be more than sufficient pressure to get full coverage and an even coat., never try to put any additional pressure with your fingers, you will mess it up.
Give it at least ten minutes to partially dry and once you are done just turn your interior upside down while tapping it to get rid of the excess flocking. I like to paint the interior first using a color similar to the flocking I am using, it will give you much better coverage at the end. After I am done, I place the interior inside my food dehydrator for a half hour, it just evens everything up much better and "burnishes" the glue around any corners and also around the transmission hump.
Don't be afraid of adding as much glue as possible to the interior floor before adding your flocking, one of the reasons I like to thin the glue is just that, it levels out nice and even. Try to use a medium size brush, it makes it easier to apply the glue more evenly than a small brush. Hope this helps......
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