Consider WD-40s New Silicon Out Perfoms Houdini!!

Although it is true that all petroleum-based lubricants attract dust, I still love WD-40s original formula lubricant, especially since the manufacturer began fitting the cans with a dual action sprayer. 

If you are lubricating door hinges, commercial store-front glass door locks, and the actual deadbolt bolts and latches, keep on using the original formula.  Why?  Because the oil-based lubricant is going to have a longer life span.

However, now that WD-40 has introduced the silicon based spray, I have quit using the original formula as a lubricant for the pins in the locks themselves.  If you do come across an ancient lock cylinder that is oily-gluey-sticky because of years of being oiled, flush it with the old WD-40.  When you are finished, follow up with the silicon-based product.  When you do, be sure to flush the lock cylinder well.

The new silicon-based product leaves behind a nice dry lubricant while creating a water-proof barrier and a residual dry coating.

As a locksmith, I have since quit using Houdini.  My experience has been that Houdini does not last very long in lock applications.  Not only that, when you spray Houdini, it shoots out like a geyser, soaks you, the door, and your customer's merchandise.  Why Houdini cannot design a nice, easy-to-use spray can is beyond belief. 

Be sure to add WD-40 silicone spray to your arsenal.  You can find it Lowe's or Home Depot.  Just look for the yellow, black, and green can.