Can this be used with oil base top coat paint to get into closed frame areas?

In theory that's what it's used for. But I couldn't get mine to spray anyting. I work for 43 years in the Collision industry and know how to make things work this would not work. And Amazon wouldn't let me return it sucks sucks sucks don't waste your money on this one and buy one that's more expensive from Eastwood.

what is the diameter of the nozzle?

approximately 3/8 to 1/2 inch. It doesn't spray a fan pattern as a typical nozzle. It has 4 90 degree holes that spray omnidirectionally.

What is the recommended [minimum] compressor tank size to operate this gun consistently?

I wouldn't recommend this gun for any purpose. I could not make mine work. I'm a retired professional from collision repair and missed the window and sending it back.I would look at the reviews before you consider purchasing this. I would recommend something that cost more although I purchased this brand before in other air tools.

can you spray ospho in tcp global air rust proofing gun?

I have not sprayed Ospho. I couldn't get anything to spray this gun read the reviews I wish I would have first I wouldn't recommend anyone buying this.

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TCP Global Air Rust Proofing and Undercoating Gun with Gauge & Suction Feed Cup, 2 Wands - 22" Long Flexible Extension Wand with Multi-Directional Nozzle - Spray Truck Bed Liner, Rubberized Undercoat

TCP Global Air Rust Proofing and Undercoating Gun with Gauge & Suction Feed Cup, 2 Wands - 22" Long Flexible Extension Wand with Multi-Directional Nozzle - Spray Truck Bed Liner, Rubberized Undercoat

Product ID: 376830438

Details

Brand
TCP Global
Colour
Silver
Material
Aluminum
Recommended uses for product
Chemical
Tank volume
325 Cubic

📏25 oz suction feed cup

⚙️Up to 130 PSI max pressure

🛠️22" flexible dual wands

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$178.78

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Description

🛡️ Spray Smart, Rust Less – The Ultimate Undercoating Arsenal!

DUAL 22 FLEXIBLE WANDS - Reach every nook with multi-directional and straight nozzles for ultimate coverage.
INTEGRATED PRESSURE GAUGE - Monitor and adjust air pressure on the fly for perfect texture and finish every time.
PRECISION PNEUMATIC POWER - Delivers consistent spray at 45-130 PSI for flawless rustproofing and coatings.
ERGONOMIC ALUMINUM ALLOY BUILD - Lightweight, well-balanced design with easy-grip trigger for fatigue-free application.
VERSATILE MATERIAL COMPATIBILITY - Works seamlessly with oil, solvent, and water-based coatings including Herculiner.

The TCP Global Air Rust Proofing and Undercoating Gun is a professional-grade pneumatic applicator designed for automotive rustproofing, truck bed liners, and rubberized coatings. Featuring a durable die-cast aluminum body, dual 22" flexible extension wands with multi-directional nozzles, and an integrated air pressure gauge, it ensures precise, versatile application of oil, solvent, and water-based materials. Ideal for reaching hard-to-access areas, this lightweight, well-balanced gun supports pressures up to 130 PSI and includes a 25 oz suction feed cup for continuous, efficient spraying.

Specifications

ASIN	B07QR18BT7
Best Sellers Rank	#105,903 in Automotive ( See Top 100 in Automotive ) #120 in Automotive Paint Guns & Accessories
Brand Name	TCP Global
Color	Silver
Customer Reviews	3.8 3.8 out of 5 stars (1,512)
Hose Length	22 Inches
Included Components	Pneumatic air application gun, two wand nozzle extensions, a multi-directional nozzle, a straight single-direction nozzle, an air pressure regulator with gauge, a 25 ounce suction feed aluminum fluid cup with cup assembly, and two attachable 22 inch flexible extension wands
Item Weight	0.96 Kilograms
Manufacturer	TCP Global
Manufacturer Part Number	UG8406
Material Type	Aluminum
Maximum Pressure	130 Pound per Square Inch
Model Number	13
Power Source	With Air Feed
Recommended Uses For Product	Chemical sprayer
Style Name	Gun
Tank Volume	325 Cubic Centimeters
UPC	848849000467

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