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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🪵 Harden your wood, not your schedule—restore with ease!

PREPS LIKE A PRO - Perfectly primes wood for seamless filling, painting, or finishing
DEEP WOOD REVIVAL - Penetrates damaged wood pores to restore strength and durability
SAFE SUSTAINABLE - Non-toxic formula keeps your workspace and environment protected
ALL SEASON RELIABILITY - Works efficiently across a wide temperature range (32°F–200°F)
EFFORTLESS APPLICATION - Brush, spray, or inject—no mixing required for instant use

PC Products PC-Petrifier is a 16 oz water-based wood hardener designed to penetrate and reinforce wood damaged by rot or insects. Its ready-to-use, non-toxic liquid formula requires no mixing and can be applied by brushing, spraying, or injecting. Ideal for prepping wood surfaces for filling, priming, and painting, it performs reliably across temperatures from 32°F to 200°F.

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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	473.18 ml (Pack of 1)
Colour	Milky White
Style	Wood Hardener
Material	Liquid
Volume	16 Fluid Ounces
Item Package Quantity	1
Temperature Range	32 - 200 Degrees Fahrenheit
Special Features	Non Toxic
Included components	(1) 16 oz Wood Hardener
Batteries included?	No
Batteries Required?	No

PC Products PC-Petrifier Water-Based Wood Hardener, 16 oz, Milky White 164440

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