First attempt at tooling putty

Got my Sarco Type M putty to install my cut glass into my practice window. I figured I would try first on a single glass pane to make sure I could get the work done right before doing all six panes. I also received a Red Devil PD-1 point driver off eBay.

I drove points into the sash to secure the glass, but noticed that they didn’t appear to be deep enough. Specifically, the points stuck out to the edge of the rabbet. I suspected these points might not be deep enough, but figured I’d try to tool the putty anyways to see what would happen. Failure would still be a helpful lesson.

I learned that these points definitely need to be set deeper. The putty needs to line up about 1/32″ inside the rabbet edge so that paint can extend over the putty and onto the glass in order to create a watertight seal. I wasn’t able to tool the putty to this line without a few points sticking out from the putty, which clearly is not how the finished product needs to be.

I also discovered that the depth screw of my eBay point driver was rusted stuck, so I was unable to adjust the depth. Decided to pull the trigger on a refurbished driver from Scott Sidler that I can be certain will work properly.

The other issue I encountered was some sort of “scaling” or “cracking” of my putty as I was tooling it with my putty knife. I didn’t seem to want to be smooth, and I’m not sure what else other than putty temperature could cause this. Some sort of friction against the putty knife maybe? I am interested to try heating the putty up more, maybe to make it “flow” a bit better and prevent dragging.

I ended up removing the putty and will re-do the work when I receive my new point driver!

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2 thoughts on “First attempt at tooling putty

  1. Love this comment! I feel like there are so many good tips in this video… (1) Let the putty sit for 5-8 minutes to adhere to the glass, (2) the importance of a polished finish on the putty knife, (3) the perpendicular tooling method, (4) the importance of knife speed, etc. I’ll definitely write a few more posts unpacking this video! Thanks John!


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