Found this leak from resovoir

[9COOP5]

I think this is antifreeze in the pics. I last put some in about 6 weeks ago when it was low and is again. Gonna look under it today but any recommendations for stop leak for small holes, etc..?

 

[swshawaii]

You need to find out WHAT the leaking fluid is. Place a clean paper towel below the leak and take a pic if you're not sure.

Did you ever repair your valve cover leak? No follow up in your thread.
Valve cover leak

 

[9COOP5]

No I have not changed the valve cover gasket. I had forgot I had posted that in 2016.
I noticed the antifreeze level has been
low the past few months, and the heat is not putting out strong as usual at times. I will look under the truck today.

 

[9COOP5]

I put this stop leak, in the gray bottle, in today around 1 pm, and it has not leaked since. I will keep check in the driveway and putting a paper towel underneath the truck for overnight or something. Heat is working well again and the gauge is not going near hot.