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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6-Pack of 1 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

🔗Boosts adhesion, prevents peeling

🖌️Reduces brush & roller marks

🛡️Stops & prevents rust

$362.93

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Description

🖌️ Elevate your exterior paint game—because your home deserves the best finish!

RUST RESISTANT ARMOR - Penetrates metal surfaces to stop rust before it starts, protecting your investment
UNMATCHED DURABILITY - Enhances paint adhesion to keep your surfaces blister- and peel-free season after season
WEATHERPROOF YOUR WALLS - Formulated to combat harsh weather effects, ensuring long-lasting exterior beauty
VERSATILE SURFACE SAVIOR - Perfect for oil/alkyd paints, primers, stains, and even weathered fiberglass—one additive, endless uses
FLAWLESS FINISH EVERY TIME - Smooths brush strokes and roller marks for a pro-level exterior paint job

Flood FLD4 Penetrol is a premium oil-based paint 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 penetrates surfaces to stop rust. Ideal for metal and weathered fiberglass, this low-odor, free-flowing formula enhances paint performance and durability under challenging weather conditions.

Specifications

ASIN	B001CSKEAU
Age Range Description	Adult
Best Sellers Rank	#512,958 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,390 in Interior & Exterior House Paint
Brand	Flood
Brand Name	Flood
Container Type	Can
Coverage	2.5-3.5 sq ft/quart, 10-12 sq ft/gallon
Customer Reviews	4.8 out of 5 stars 53 Reviews
Dry Time In Hours	24
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 Feature	special_feature
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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$362.93

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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