I have been thinking of Conformal Coating and just forgetting eraser and all that stuff.
http://www.alliedelec.com/search/pro...px?SKU=6610076
Next time install the CPU first 

 then put the eraser all the way to the top. Its a pain after get everything all nice and completed to have to pull back the eraser to put a CPU in, you get good at that after awhile tho. swapping or remounting CPU's 
 
On the edge of the GPU cards I smear a little Vasoline incase anything drips down into the PCIe socket.
Looks great tho !