Used it for years. It spreads nice and is easy to sand. Also it's really cheap at Wal-Mart.
Bondo Glazing & Spot Putty (Bondo Red) is indeed a one-part solvent based putty
Here is the spec sheet from 3M for Bondo Professional Glazing & Spot Putty (Bondo Pro or Bondo 801) https://www.3m.com/3M/en_US/company-us/all-3m-products/~/Bondo-Professional-Glazing-and-Spot-Putty/?N=5002385+3293241613&rt=rud
Quickly bonds to primer, metal, fiberglass and aluminum
Two-part component formula delivers excellent durability and less shrinkage
Quickly repairs paint scratches, minor dents and stone chips
Good spreading properties allow for ease of use
Fast curing makes putty sandable in only 20 minutes
Putty is compatible with all types of automotive paint systems
Use during the Fill stage of the 3M™ Body Repair System
Bondo® Professional Glazing & Spot Putty smooths and repairs pin holes, scratches, nicks, minor dents, stone chips and other surface imperfections in automotive paint and bodies. This product is a 2-part component formula that securely and quickly bonds to primer, metal, fiberglass and aluminum.