One review stated this was used to preserve a rust patina. Would this help automotive clear spray adhere and preserve the rust on an old milk can?

I only used this product to remove a lot of old rust on an outdoor iron rack. It didn't do the job. Don't have experience with the other product or method you are attempting.

Why is it "exterior only"? Can it not be used with interior oil based paints? (with proper ventilation, I assume the fumes are bad)

Yes you are correct. When spraying the oil based paint along with penetrol are a bit overwelming with fumes. I have used a mid priced automotive paint resporator to spray interior doors and trim. Remember that oil based paints are hard to clean up(more masking, longer cleaning time, more spray gun cleaning, solvents, and lots of basic throwing away of brushes, rollers, trays, drop clothes)

Can I use penetrol as a top coat over enamel paint?

I wouldn't. That's not what it's for. It's a paint additive to remove lap marks when the paint is still wet, and it works well as a way of preventing rust from further oxidation and keeping the patina of rust, but it's not a top coat the way that other clear coats might cover over paint.

Can this be used with water-based urethane alkyd enamel?

This is only for oil based paint.

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qt Flood FLD4 Penetrol Oil-Based Exterior Paint Additive

qt Flood FLD4 Penetrol Oil-Based Exterior Paint Additive

Product ID: 13033032

Details

Brand
Flood
Finish Type
Matte
Indoor/Outdoor Usage
Outdoor
Item Volume
1 quarts
Paint Type
Oil
Size
32 Fl Oz (Pack

🖌️Reduces brush & roller marks

🛠️Stops & prevents rust

🛡️Boosts adhesion to prevent peeling

Description

🖌️ Elevate your exterior paint game—because your projects deserve the pro touch!

RUST ARRESTOR POWER - Effectively halts rust progression while preserving vintage patinas
VERSATILE RESTORATION - Revives faded bumpers and plastic trims with ease—no costly replacements needed
EFFORTLESS APPLICATION - Slow drying formula allows even, controlled coverage for perfect results
LONG LASTING PROTECTION - Enhances paint adhesion to keep surfaces pristine and peel-free
FLAWLESS FINISH EVERY TIME - Smooths brush and roller strokes for a professional look

qt Flood FLD4 Penetrol is a premium oil-based additive designed for exterior alkyd and oil paints, primers, and stains. It reduces brush and roller marks, improves adhesion to prevent peeling and blistering, and stops rust, making it ideal for metal, wood, and stone surfaces. Trusted by DIY pros and restoration enthusiasts alike, Penetrol extends the life and beauty of your outdoor projects with a smooth, durable finish.

Specifications

ASIN	B001CSKEAU
Age Range Description	Adult
Best Sellers Rank	#151,921 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #546 in Interior & Exterior House Paint
Brand Name	Flood
Container Type	Can
Coverage	2.5-3.5 sq ft/quart, 10-12 sq ft/gallon
Customer Reviews	4.8 4.8 out of 5 stars (53)
Finish Type	Matte
Included Components	....
Indoor Outdoor Usage	Outdoor
Is Waterproof	False
Item Form	Liquid
Item Type Name	...
Item Volume	1 quarts
Item Weight	2.3 pounds
Manufacturer	Flood
Model Name	Penetrol
Model Number	00410
Paint Type	Oil
Part Number	FLD4-04
Size	32 Fl Oz (Pack of 1)
Special Features	special_feature
Specific Uses For Product	Exterior
Surface Recommendation	Metal
UPC	010273004100
Unit Count	32 Fluid Ounces
Water Resistance Level	Water Resistant

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