How long should I let my filter using oil paints dry before I apply another filter on top of it? Sorry if this question has been asked a dozen times. The filter has been applied over a gloss surfce of Future, if it matters.

You have to remember that no matter how long you let it dry, if you are using any solvent to thin the wash, it will wash off the previous wash if not careful. I use mostly Mig Washes, and tend to wait about an hour, if it is heavy washes, I clear coat in between.

You can use hair dryer if you don't want to wait more...

I always give it at least a day.

Filters stay in place best on a flat clear coat. Filters made with odorless mineral spirits dry the fastest. In the best conditions they can appear dry in a few hours and you can apply another filter, preferably in another area. It really needs at least overnight, or a day if you can wait.

thanks for the help guys!

Jon,
If you are using oils, try using a piece of cardboard as a pallet. When you place a dab of oil paint on the cardboard, you will notice that after a few minutes, there is a hallow -or- wet spot on the cardboard surrounding the dab of color. This is the cardboard wicking away some of the carrier in the oil psint. This will give a slighlty more matt finish & enable the oils to dry a little bit faster. But as stated above, unless you use a hairdryer, you should be prepaired to let them sit at least over night.
Also, a filter will work better for you over a satin surface in my humble opinion, as these have more tooth for the color to hold on too. When you apply oils onto a gloss surface and then work the filter with a brush and thinner, you will find that much of your work will come back off. Think of a satin surface like ultra fine sand paper & a gloss surface like a sheet of glass......wet things do not penetrate the glass surface and come right back off! Sorry, this is the best analogy I could come up with.

In oilpainting, drying time varies depending on how heavy your paint layer is. This can take up to a week to reach toucheable levels. With something as highly diluted as a wash or a filter, take at least a day to be certain, That or, as already mentioned, use a hair dryer. Take an invisible spot or use a painting dummy to check how long you need for this process.