18x18 3D Professional 2.5" Deep K2 Stretcher Frame Kit

True 1:1 Square Proportion - 18x18 Size

The 18x18 square size is a little less common but gaining in popularity.

The square is perhaps the most intriguing proportion, as it is root of all of the other proportions. It is commonly used in both photography and art. Squares are typically used as the center canvas of a triptych or as a single canvas hung at a 45° angle. The square proportion is long used with medium format professional cameras, and most photographs we see on websites and social media are based on square images. Since all sides of the canvas are the same length, your eye is drawn evenly across the surface of the painting creating a sense of harmony, balance, and a generally a pleasing visual experience. The square format is also a good choice for artists who focus on geometric shapes or patterns in their work, as the regularity of the square shape can help reinforce these elements. Some artists enjoy the challenge of working within the confines of a square format, as it forces them to think creatively resulting in intriguing compositions.

Explore other sizes in this same 1:1 aspect ratio:

11x11 • 12x12 • 13x13 • 14x14 • 15x15 • 16x16 • 17x17 • 19x19 • 20x20 • 21x21 • 22x22 • 23x23 • 24x24 • 25x25 • 26x26 • 27x27 • 28x28 • 29x29 • 30x30 • 31x31 • 32x32 • 33x33 • 34x34 • 35x35 • 36x36 • 37x37 • 38x38 • 39x39 • 40x40 • 41x41 • 42x42 • 43x43 • 44x44 • 45x45 • 46x46 • 47x47 • 48x48 • 49x49 • 50x50 • 51x51 • 52x52 • 53x53 • 54x54 • 55x55 • 56x56 • 57x57 • 58x58 • 59x59 • 60x60 • 61x61 • 62x62 • 63x63 • 64x64 • 65x65 • 66x66 • 67x67 • 68x68 • 69x69 • 70x70 • 71x71 • 72x72 • 73x73 • 74x74 • 75x75 • 76x76 • 77x77 • 78x78 • 79x79 • 80x80 • 81x81 • 82x82 • 83x83 • 84x84 • 85x85 • 86x86 • 87x87 • 88x88 • 89x89 • 90x90 • 91x91 • 92x92 • 93x93 • 94x94 • 95x95 • 96x96 • 97x97 • 98x98 • 99x99 • 100x100 • 101x101 • 102x102 • 103x103 • 104x104 • 105x105 • 106x106 • 107x107 • 108x108 • 109x109 • 110x110 • 111x111 • 112x112 • 113x113 • 114x114 • 115x115 • 116x116 • 117x117 • 118x118 • 119x119 • 120x120

• Super strong 3D™ Pro K2™ Stretcher Bar is a very popular among contemporary artists whose painting will be displayed without a frame.
• For this 18x18 large size frame, the frame provides the ultimate foundation for your art with increased strength and stability
• Provides a 2.5" deep stretched canvas which makes a bold and commanding display
• 1-1/4" wide Stretcher Bars
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

3D™ Pro 2.5 Stretcher Bar • 1/2" Canvas Clearance

1/2" Canvas Clearance is the space between the Bar and the canvas. Generally speaking, more clearance reduces the risk of the canvas touching the wood and creating unsightly lines during painting. Our design provides the optimal clearance so as not to impact your painting, but still leaving enough wood to the maximize strength of the Stretcher Bar.

• Produces a 2.5" deep stretched canvas (Actual depth is slightly thinner)
• 1.25" wide Stretcher Bar
• All Bars have an exclusive groove on the inside perimeter of the frame to which cross braces and Diamond Corner Braces attach
• Solid Ponderosa Pine or Fir from the Pacific Northwest

Solid Wood is Archival - Finger Jointed Wood is Not

We only use Solid Wood to build our Stretcher Bars because a solid piece of wood will last indefinitely. When we speak of archival value, it's not just the paint you use and the quality of your canvas and ground, even the wood choices manufacturers make are part of the archival process.

The principal reason manufactures use finger jointed wood is reduce cost, not increase archival value. Wood constantly grows and shrinks when the environment becomes hotter, or colder, or more humid, or more dry. Because finger jointed wood is made-up of multiple and varied pieces of wood, with varying grain patterns and densities, they each absorb and shed moisture at varying rates, which works on the glue joints that hold them together, causing the wood to bow and the joints to eventually fail, and certainly not consistent with increasing the archival value of your artwork frame support.

As a manufacturer, we do our part to conserve as much wood as possible, and still provide a quality made product that will out-perform any other in the marketplace.

Sustainable Forests for Future Generations

Sustainable forestry practices go beyond just planting and harvesting trees. They also involve careful planning, monitoring, and management to ensure the long-term health and productivity of the forest. By using lumber from sustainably managed forests, we can support these important practices and help to ensure that our planet's forests remain healthy and productive for generations to come.

Specially Dried and Heat Treated Lumber

Our wood is handpicked from a curated group of environmentally responsible lumber mills in the Pacific Northwest. By adhering to our precise drying and heat-treatment standards, these mills produce lumber with nearly half the moisture you'd find in common home improvement outlets or lumber yards. This meticulous process not only enhances the wood's strengthÑminimizing risks of cracks, splits, or bendsÑbut also elevates its dimensional stability. Such quality, despite its premium, is paramount in creating professional canvases designed to uphold the sanctity of your cherished art throughout the years.

26x26 is the Canvas Size Needed for this 18x18 Frame

Please note that you will need a canvas that is at least 8 Inches larger than the actual frame size to ensure proper stretching. This will provide ample material to stretch the canvas and attach it to the back of the frame. If you prefer to attach the canvas from the edge of the stretcher frame, you can reduce the size of your canvas by approximately 3/4" all the way around the frame. This will allow you to paint on the edge of the canvas and hang your artwork without needing a separate picture frame. And, if you ever need to remove the canvas from the frame and re-attach it, you'll have enough material to do that too.

Tight'n'Up™ Liquid Canvas Retensioner

One of our most appreciated products helps make your canvas tighter! Stretching a canvas tightly can be a challenge. Our Frame Kits include the Corner and Brace Keys that you will need to add tension, but Tight'n'Up™ Liquid Canvas Re-Tensioner is a way that you can use to add tension to the canvas without needed to use the keys. It canvas be sprayed on the back of a canvas to repair most canvas tension issues.

With Tight'n'Up™, you can add tension to just a small area, or a large area. Simply spray it lightly on the back and brush it into the canvas, and within seconds, your canvas becomes tighter and stays tighter. The more you use, the tighter it gets. Recommended for acrylic primed cotton or linen canvas. We do not recommend it for oil primed canvas because there are simply too many different types of oil primed canvas, but used conservatively at your own risk, it will tension any canvas.

Masterpiece® is a family-owned business operating in California since 1965 and producing the finest Stretcher Bars in North America. We deliver the highest quality and highest performing products in the business. We are widely recognized as the nation's leader and trendsetter of professional quality fine-art canvas. We own several patents that make our products perform superior to any other on the market. Once you touch one of our products, you'll immediately recognize our impeccable qualityÑand more importantly, so will your clients and those who acquire your art

A portrait is a painting with something wrong with the mouth. ♦ John Singer Sargent

There's an undeniable wit to this statement, yet also a humble reflection of Sargent's meticulous nature. He was renowned for his ability to capture the exacting details of his subjects, yet even he felt the challenges inherent in achieving perfection, particularly with the mouth Ð a focal point of expression. This serves as a comforting reminder for artists who strive to perfect our composition, yet there are always aspects that elude our utmost efforts. Rather than discouragements, these are the nuances that push us to grow, evolve, and persist in our artistic pursuits.

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Every artist thrives on inspiration. So we've offer this insightful quote with a uniquely crafted portrait of John Singer Sargent. May this story invigorate your creativity! Start painting!