Maxwell's Equations. We now have the tools to derive some very useful relationships between thermodynamics variables. Maxwell's equations are based on the same principle as was Euler's test for exact differentials, namely that mixed second derivatives of nice functions must be equal.
Depending on the stain technique it can take anywhere from 2 to  24-hours for the stain to dry. For cabinets, you should wait the  entire 24-hours to make sure the stain is â¦not still tacky and to  prevent smudges on the finish.
To achieve a darker stain color, use coarser grit of sandpaper (#150-#180) on the last sanding you do prior to staining. This will help the wood absorb more color. You can also leave the wet stain on the wood for longer before you wipe away the excess - sometimes as long as 15 minutes. This may help you achieve a deeper color. Note: check the label directions for the particular stain you're using to see the maximum time you can wait before wiping off the excess stain.