Slic3r support adhesion

Hello all! Does anyone know if it's possible to create a 100% fill underneath a support generated by Slic3r? The default 50% doesn't stick well enough for the smaller pillars. The brims help but I can only get them to attach to the pillars that are on the outer perimeters.

There is a "quick and dirty" fix for this problem that I use sometimes on bigger parts.
Once the last support layer is printed I brush a thin layer of ABS juice on it.
This gives a slightly rised surface that provides better adhesion, and yes, I use it for PLA as well, just Nylon is a pian in the ....

It also helps to increase the extrusion width for the first layer and to use a very low speed for the first layer.
Problematic parts I tend to print with below 25mm/s for the first layer.

Thanks Downunder! I'll give that a shot.