How much Gloss Varnish do i need to properly coat an 18"x24" Canvas?

There is a formula for paint coverage on YouTube that specifies the number of ounces/grams needed to cover a canvas. I'm not sure if it would answer your needs, but here it is. Measure your canvas height and width then multiply them by each other to get the square inches. Multiply the square inches by 0.1 to get the ounces needed to cover your canvas. To convert to grams, multiply the ounces by 28. This is only a rough guide as the paint consistency will affect coverage, i.e., the thinner the paint, the fewer ounces needed.

What is the effective difference between normal matte medium and the matte fluid medium?

The normal matte medium will only produce a matte effect on the paint. The matte fluid medium will give the same matte effect, but will also lessen the viscosity of the acrylic paint you’re mixing in making it thinner and slightly more transparent (depending on the amount of medium added).

can it withstand high heat ?

Yes it will but I wouldn't put it outside in the direct sun. You would need a varnish for that.

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Liquitex BASICS Gloss Varnish, 250ml (8.4oz) Bottle

Liquitex BASICS Gloss Varnish, 250ml (8.4oz) Bottle

Product ID: 44514115

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Details

Brand
Liquitex
Color
Gloss Varnish
Finish Type
Gloss
Size
8.45 Fl Oz of
Item Volume
250
Special Feature
UV Resistant

💧250ml premium gloss varnish

☀️UV resistant for color protection

🖌️Dries clear & non-yellowing

Description

✨ Seal your brilliance with gloss that lasts! 🖼️

SAFE CERTIFIED - ACMI certified and ASTM d4236 compliant, making it ideal for professional studios and educational environments alike.
CUSTOMIZABLE SHEEN - Mix with matte varnish to tailor your finish from satin to high gloss—perfect for any creative vision.
UV DEFENSE TECHNOLOGY - Protect your masterpieces from fading and discoloration caused by sunlight and heat, ensuring longevity.
EFFORTLESS APPLICATION - Designed for smooth, even coverage with a large soft brush, drying to a flexible, non-tacky surface that lasts.
ULTIMATE SHINE PROTECTION - Enhance your artwork with a permanent gloss finish that boosts color vibrancy and guards against dirt and damage.

Liquitex BASICS Gloss Varnish is a 250ml acrylic-based protective finish that dries clear and non-yellowing, offering UV resistance and enhanced color saturation. Perfect for indoor acrylic paintings, it provides a durable, flexible, and permanent gloss coating that safeguards artwork from dirt, humidity, and fading, while being safe for educational and professional use.

Specifications

Brand	Liquitex
Color	Gloss Varnish
Finish Type	Gloss
Size	8.45 Fl Oz (Pack of 1)
Item Volume	250 Milliliters
Special Feature	UV Resistant
Unit Count	8.45 Fluid Ounces
Paint Type	Acrylic
Specific Uses For Product	Use on All acrylic surfaces, Designed for interior and exterior use
Indoor/Outdoor Usage	Indoor
Item Form	Liquid
Included Components	GLOSS VARNISH
Age Range (Description)	Adult
Is Waterproof	True
Model Name	BASICS
Package Information	Bottle
Color Code	transparent
Coverage	Adds a gloss sheen, protects and stops dirt build up, Dries clear to a flexible, non-tacky, hard surface, Increases brightness and color saturation, Improves surface durability - ideal when shipping or exhibiting, Protects colors from UV light damage, Resists discoloration - yellowing and fogging - caused by humidity, heat and UV, Use on flexible or rigid supports
UPC	094376977547
Global Trade Identification Number	00094376977547
Manufacturer	ColArt Americas
Part Number	1041008
Item Weight	10.2 ounces
Product Dimensions	5.9 x 2.2 x 2.2 inches
Item model number	1041008
Style	Gloss Varnish
Finish	Gloss
Material	Acrylic
Item Package Quantity	1
Number Of Pieces	1
Special Features	UV Resistant
Batteries Included?	No
Batteries Required?	No