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 Products PC-Petrifier Water-Based Wood Hardener, 16 Fl Oz (Pack of 1)

PC Products PC-Petrifier Water-Based Wood Hardener, 16 Fl Oz (Pack of 1)

Product ID: 5489512

Details

Brand
PC Products
Item Form
Liquid
Material
Liquid
Special Feature
Non Toxic
Specific Uses For Product
wood

🌿Non-toxic and water-based formula

💧Low viscosity for deep wood penetration

🛡️Restores wood to near structural integrity

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Description

🛠️ Revive, Restore, Repeat — Because your wood deserves a second chance!

TRUSTED LEGACY - From PC Products, 75 years of expert repair solutions you can rely on.
PREP LIKE A PRO - Prepares wood surfaces flawlessly for priming, painting, or filling—no guesswork needed.
ECO SAFE RESTORATION - Water-based and non-toxic once cured, perfect for sustainable home projects.
VERSATILE WOOD SAVIOR - Ideal for window sills, trim, beams, and more—revive your wood without structural repairs.
DEEP PENETRATION POWER - Low viscosity liquid seeps into soft, rotted wood fibers for maximum restoration.

PC Products PC-Petrifier is a 16 fl oz water-based wood hardener designed to penetrate and revitalize rotted or insect-damaged wood. Its low viscosity formula restores wood to near structural integrity, preparing surfaces for priming and painting. Non-toxic once cured and water-resistant, it’s ideal for repairing window sills, trim, and decorative wood elements. Trusted by professionals and DIYers alike, this product offers a reliable, eco-friendly solution for wood restoration.

Specifications

ASIN	B00081FW1I
Best Sellers Rank	#3,549 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Wood Filler
Brand Name	PC Products
Color	Milky White
Compatible Material	Wood
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (2,998)
Full Cure Time	24 Hours
Global Trade Identification Number	00054983164440
Included Components	(1) 16 oz Wood Hardener
Item Form	Liquid
Item Package Quantity	1
Item Type Name	PC-Petrifier Water-Based Wood Hardener
Item Weight	16 ounces
Manufacturer	Protective Coating Co.
Material Type	Liquid
Model	164440
Number of Pieces	1
Other Special Features of the Product	Non Toxic
Part Number	164440
Specific Uses For Product	wood
UPC	742839405068 054983164440 330051852304 305487753631 549831644408 300718774270 802201404713 719243464363 742839405938 094089050049 355135632474 078433169595 651628774912
Unit Count	16.0 Fluid Ounces
Viscosity Level	Low
Volume	470 Milliliters
Warranty Description	Warranty
Water Resistance Level	Water Resistant

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