Currently working on installing a window recess and window sill in MDF. What I'm wondering now is how do I handle the latex sealant that goes between the recess and the windows? Should I apply it to the MDF before pressing it against the window or do I apply a line after mounting the MDF?
MDF window sill being installed beneath a window; screws visible on the surface. Outdoor lawn is visible through the window.
 
I prefer to place a thin string at the angle and then drag my finger over it. After that, I paint. I recall that I usually apply a primer first, then use soft joint sealant, and finish with the final coat of paint.
 
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JS80
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Do you really need sealant for this? The paint should cover the tiny bit that might be left.
 
In some places, there are gaps so little sealant is needed ;)
 
When I performed the same operation, I masked the window frame about 2 mm above the surface of the smygskiva, applied soft sealant, and painted.
 
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JS80
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