Since I don't want to sand stain off the soft wood, would it work to drill small holes into the wood and "inject" the product directly into the holes?

I think this might work, I had very old shed with rotten windows sills and drilled holes in rotten wood. This was some years back. If I remember correctly it instructed you to drill holes for deeper penetration of the decayed areas of the wood. I will say the wood was more like rock when hardened

I'm replacing slats in an old bench with new pine. Would this be good to harden and waterproof the new/undamaged wood, then stain after?

No, new wood won't absorb it very well. It's for old spongy wood. There must be other products that are designed for preservation rather than restoration. (BTW, I wasn't impressed with it for old wood either.)

Can this be used on mdf or particle board that has begun to expand and separate slightly? Such as the bottom of an arcade cabinet?

This will stop rot and hold together wood that has become rotten. The expansion will not go away. You might use in conjunction with yellow carpenters glue (water proof) and clamp the cabinet to force expansion and separation back to proper form. I have used on wood that had termite and water damage and the restorer hardened the wood and do the same for manufactured wood.

Does the wood need to be completely dry?

I'm guessing it would be better if the wood was completely dry but I do it with wet wood all the time. I stabilize wood with this and I use a vacuum pump to do it. Once the vacuum pump draws a suction on the wood while it's submersed in the hardener it will have all the air sucked out of it and the hardener will will saturate it to the bone so the thing will be stabilized so that you could run it through the dish washer. There are several videos on this on YouTube. Hope this helps.

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💪 Restore, Reinforce, Reimagine Your Woodwork!

PREP PROTECT - Seals wood to prevent future damage and primes surfaces for flawless painting or finishing—your secret to lasting beauty.
DEEP WOOD REVIVAL - Penetrates deeply to restore and strengthen soft or rotted wood, extending the life of your cherished woodwork.
ECO SMART FORMULA - Water-based and low-odor, perfect for indoor use without harsh fumes—safe for your workspace and the planet.
ALL SEASON DURABILITY - Operates effectively between 33°F and 200°F, ensuring protection through every season and climate.
FAST TRACK RESTORATION - Achieves initial cure in just 24 hours, so your projects move from damaged to durable in no time.

PC Products Pc-petrifier is a 470ml water-based wood hardener designed to restore and strengthen soft or rotted wood in non-structural areas. Its thin consistency deeply penetrates wood fibers, curing initially within 24 hours and fully in 3-7 days. Suitable for prepping old wood for painting, it operates effectively across a wide temperature range (33-200°F), providing durable protection and sealing against future damage.

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Manufacturer	Protective Coating Co.
Part number	164440
Item Weight	454 g
Product Dimensions	20.96 x 6.35 x 6.35 cm; 453.59 g
Item model number	164440
Size	16 oz
Color	Milky White
Volume	16 Fluid Ounces
Item Package Quantity	1
Specific uses	Bottle
Batteries Included?	No
Batteries Required?	No

PC ProductsPc-petrifier Water-based Wood Hardener, 470ml Bottle, Milky White

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