I use Homax, Sherwin Williams refinishing products. My favorite products are Dupont Bondo,Zinsser Bullseye primer,3m masking paper and tapes, TSP (Tri sodium Phosphate) Milwaukee sanding disks.
Refinishing is also a detailed process, manufactures of refinishing kits  mostly up-play how simple it is for a homeowner to follow step by step instructions on the procedure, turning things into a disaster, to do a  long lasting job please hire a professional.