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

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

Product ID: 253302973

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Details

Brand
PC Products
Specific uses for product
Bottle
Item form
Spray
Colour
Milky White
Item package quantity
1

⏳Fast 24-hour initial cure, full cure in 3-7 days

💧Water-based formula for eco-friendly restoration

🌡️Wide service temperature range 33-200°F

Description

💪 Restore, Reinforce, and Reimagine Your Woodwork!

SEAL SHIELD - Seals wood fibers to prevent future damage and extend wood life
PREP LIKE A PRO - Prepares old wood perfectly for priming and painting, ensuring lasting finishes
DEEP WOOD REVIVAL - Penetrates deeply to restore and strengthen soft or rotted wood
ECO SMART PROTECTION - Water-based, low-VOC formula safe for indoor use and the environment
ALL SEASON DURABILITY - Operates effectively from freezing to hot conditions (33-200°F)

PC Products Wood Hardener is a water-based, eco-friendly solution designed to restore and strengthen soft or rotted wood in non-structural areas. With a thin consistency for deep penetration, it cures quickly within 24 hours and fully in 3-7 days, operating effectively across a broad temperature range of 33 to 200°F. Ideal for prepping old wood for painting and sealing against future damage, it’s the smart choice for durable, long-lasting wood restoration.

Specifications

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

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