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, elevate your space—don’t let rot win!

COMPACT POWER - 8 oz bottle delivers medium coverage—ideal for targeted repairs without waste.
REVIVE REINFORCE - Transforms weakened wood into a sturdy surface, minimizing costly replacements.
OUTDOOR READY FORMULA - Designed to withstand outdoor conditions, extending the life of your wood projects.
EFFORTLESS APPLICATION - No mixing needed—just brush, spray, or inject for instant penetration.
PERFECT PREP FOR PAINT - Seals and hardens wood pores, ensuring smooth priming and painting every time.

Protective Coating 8 Oz Wood Hardener is a ready-to-use liquid solution that penetrates and strengthens wood damaged by insects or rot. It prepares surfaces for filling, priming, and painting, improving wood hardness and reducing the need for removal. Ideal for outdoor use, this 8 oz bottle offers medium coverage and easy application without mixing.

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Brand	PC Products
Finish Type	Brushed
Size	.1 Pack (8 oz)
Item Volume	8 Fluid Ounces
Paint Type	Oil
Surface Recommendation	Wood
Indoor/Outdoor Usage	Outdoor
Item Form	Liquid
Is Waterproof	False
Package Information	Bottle
Coverage	Medium
UPC	742839405914 791429191645 742839405051 054983084441 549830844410
Global Trade Identification Number	00549830844410
Manufacturer	Protective Coating Co.
Weight	0.3 Kilograms
Item package quantity	1
Appropriate Age Range	Adult
Item model number	84441
Product Dimensions	20.96 x 9.53 x 6.35 cm; 300 g

Protective Coating 8 Oz Wood Hardener 084441

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