I haven't tried mold prep but have used white lithium grease with Teflon, Cyclo brand, which seemed to work well.  I put the patched bullets on an old cookie sheet, sprayed them with grease and rolled them around some, let them dry awhile and loaded them.

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Rooster Red Jacket Lube is what I use. It was made for lubing PP bullets. It dry lubes the paper and is waterproof.  Unfortunately it is no longer produced and there is none on the retail market.  

Hank - again ... let me ask - why are you interested using mold prep?

Rooster Red Jacket is available from Buffalo Arms.  Their web site shows it as "ample stock".

Thanks Letterman that it is still available.  For those that haven't tried the Rooster lube - might recommend trying some

Hank45

I haven't loaded paper patch bullets in quite some time.  When I did load them, I simply wiped some pure Neetsfoot Oil on the patch and let it dry.  I used them with black powder and wiped between shots.  It worked well.

With regards to Mould Prep, it contains graphite.  About two years ago I experimented with coating my bullets with graphite.  To make a long story short, it didn't work well because the graphite made the lead too slick and the bullets ran away from the pressure going down the barrel.  It gave me very inconsistent velocities and poor accuracy.  Just food for thought.

feather

Where can I find rooster lube? Thanks for your answer  Hank45

For a grease cookie I would recommend 40% paraffin, 40 %mutton tallow (available from Dixie gun Works), and 20% beeswax. I put  dollop of anhydrous lanolin in the mix also. 

An easy way to make the cookies is to put a piece of waxed paper on a sheet of plate glass put two strips of wood of the thickness you want the wad to, place a piece of the lube between the sticks. Cover with another piece of waxed paper and roll out with a rolling pin. 

Bill