Pellet Stove Smoking from Chimney Pipe Seams

We installed a St. Croix Prescott EXL two years ago and have had a really good run. We installed the Duravent 3" chimney liner kit ourselves, sealed the pipes with RTV, and were happy and warm

What is this black watery stuff leaking from the top of my stove pipe? : r/woodstoving

Stove pipe is leaking smoke into the house.

Understanding Draft

Pellet stove leaks smokepipe installation right?

DuraVent 6 PelletVent Pro Straight Length Pipe, 3 / Black 3PVP-06B

Pellet Stove Smoking from Chimney Pipe Seams

Furnace cement on pipe joints -- does it last?

PelletVent is a complete venting system from DuraVent for stoves and inserts that use oil fuel or multi-fuels (including wood pellets, corn, cherry pits, switch grass, coffee husks, walnut shells, soybeans, wheat, sunflower hulls, rapeseed and sugar beets). The Double-Wall Chimney Pipe Increaser is designed for use with wood pellet-burning appliances and features twist-lock connections for fast, easy installation, enabling transition from a 3 in to 4 in pipe.

DuraVent 3PVL-X4 PelletVent Increaser - 3 in. to 4 in.

Need help assessing wood stove and chimney after a chimney fire on Christmas Day : r/woodstoving

Chimney Liner Kits – Stainless Steel Flue Liner DIY

All-Fuel Chimney - Sure-Temp