Will it take a water-based stain?

Not in my experience. I don't think I've ever used a water-based stain, but it doesn't take regular stains at ALL. (Minwax, etc.) The label and directions indicates stainable. I don't know how they can claim this, even with our corrupt gvmt agencies. What I do is use WHITE hardener (which they no longer include) and then mix in some pigment. Italian Burnt Sienna gets very close to the typical "Golden Oak" color. Other pigments can nail Maple, Mahagony, etc with a little practice. Bondo really should sell an optional coloring kit, with selected pigments plus white hardener.

Can this product be molded so as to create a 1" vertical edge as it's being applied or does it need a temporary barrier to keep it in place?

My experience working with the Bondo Wood Filler leads me to believe it requires a temporary barrier to form a 1" vertical edge. While the mixed compound is not "soupy," it is not so firm as to avoid slumping unless you were to build up the vertical edge in small (say 1/4") layers. After a few minutes the mixture does become firm enough to stand on it's own but at that point is unworkable. I hope this answer is clear and correctly addresses your question.

Did you find it hard to sand/shape? I'll be filling cracks and holes in deck wood, and want to "feather" it in flush w/wood.

I have 20+ years in contract office furniture, specifically in Operations (8 years in Service) & Bondo is great for filling dents, divots, etc. I recommend using a non-flexible flat metal/plastic surface for your pallet. Work fast, it hardens quickly. Start with 120 grit & reduce to 220. We sprayed a light coat of primer to check our feathering.

What ratio do you use for wood filler to hardener? I find the directions confusing

They say to put down approximately a 3 inch wide circle of the filler about an inch deep and then squeeze a 3” bead of hardener across the top of the putty and mix until the color is uniform. In reality it doesn’t matter all that much. The more hardener you use, the faster it dries. But due to the way it dries, once it starts getting hard, it dries very fast. I always end up with hardener left after the putty runs out. This stuff isn’t like paint or normal stuff that dries linearly — it already dries very fast so you need to be ready to use your whole batch before you add the hardener and start mixing.

Manufacturer	Bondo Home Solutions
Part number	WF-QT-ES
Item Weight	1.06 Kilograms
Product Dimensions	10.8 x 17.78 x 10.8 cm; 1.06 kg
Item model number	20082
Size	Filler 1.9 pounds, Hardener 1 ounce
Color	Light Brown
Style	Bondo 20082 Home Solutions Wood Filler, 1 Quart
Material	Resin
Pattern	Filler
Item Package Quantity	1
Special Features	Two-part formula, Quick and durable repairs, Sandable in 15 minutes
Specific uses	Wood-based surfaces and materials
Included components	3M Bondo Home Solutions Wood Filler
Batteries Included?	No
Batteries Required?	No

Bondo Home Solutions Wood Filler, Sandable in 15 min, 1.9 lbs with 1 oz Hardener

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