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 Undercoating Spray Gun with Gauge, Suction Feed Cup

TCP Global Air Undercoating Spray Gun with Gauge, Suction Feed Cup

Product ID: 126267136

Details

Brand
TCP Global
Color
Silver
Item Weight
0.96 Kilograms
Material
Aluminum
Tank Volume
325 Cubic

🔧Lightweight 0.96 kg aluminum body

⚙️130 psi max pressure

🛠️2 x 22" flexible extension wands

R1818

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Description

🚗 Spray Like a Pro, Protect Like a Boss!

REACH EVERY NOOK AND CRANNY - Two 22" flexible extension wands, including a multi-directional nozzle for those impossible angles.
DURABLE YET LIGHTWEIGHT DESIGN - Die-cast aluminum body with ergonomic grip for fatigue-free, professional-grade spraying.
TRUSTED BY PROS DI YERS ALIKE - Reliable performance backed by responsive customer service—spray smarter, not harder.
VERSATILE APPLICATION POWERHOUSE - Perfect for rust proofing, undercoating, chip guard, and truck bed liners with oil, solvent, or water-based coatings.
PRECISION CONTROL AT YOUR FINGERTIPS - Built-in air regulator with gauge for flawless texture and flow every time.

The TCP Global Air Undercoating Spray Gun UG8406 is a professional-grade pneumatic sprayer featuring a durable aluminum body, built-in air pressure regulator with gauge, and two 22-inch flexible extension wands for precise application in hard-to-reach areas. Designed for automotive rust proofing, undercoating, and chip guard tasks, it supports oil, solvent, and water-based coatings with a maximum pressure of 130 psi. Lightweight at under 1 kg, it balances comfort and control for both professional and DIY users.

Specifications

ASIN	B07QR18BT7
Best Sellers Rank	#13,836 in Automotive ( See Top 100 in Automotive ) #13 in Body Repair Paint Spray Guns
Brand	TCP Global
Brand Name	TCP Global
Color	Silver
Customer Reviews	3.8 out of 5 stars 1,582 Reviews
Hose Length	22 inches
Included Components	2 attachable 22" long flexible extension wands
Item Highlight	Two Wands - 22" Long Flexible Extension Wand with Multi-Directional Nozzle, Sprayable Bed Liner,Rubberized Truck Undercoating
Item Weight	0.96 kg
Manufacturer	TCP Global
Manufacturer Part Number	UG8406
Material	Aluminum
Material Type	Aluminum
Maximum Pressure	130 psi
Model Name	UG8406
Model Number	13
Number of Items	1
Number of Packs	1
Power Source	Compressed Air
Recommended Uses For Product	Chemical sprayer
Style Name	Gun
Tank Volume	325 cubic centimeters
UPC	848849000467

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TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

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

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R1818

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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