Instructables
Picture of Turning a bulletin board into a canvas
In this Instructable,  I will be using an old, cork bulletin board- and re-invent it as a usable alternative to a basic canvas. 
 
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Step 1: Supplies

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Aside from the cork-board, supplies needed consist of a piece of linen or cotton canvas. This piece of fabric should be at least 2-4 inches, give or take, larger than the circumference. Although I am using a hammer and nails in this tutorial, using the traditional nail-gun would work just as well.

Step 2:

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This step shows how much larger the fabric should be up against the base. Your goal is to be able to wrap the canvas around the wood. It is safer to go about accidentally cutting the fabric too large rather than too small. Experienced artist know that linen fabric is a terrible, expensive thing to waste.

Step 3:

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Using a nail-gun is a popular, effective way to seal fabric against the wooden base. However, if it is not availible, using basic hammer  and nails is just as effective, but operates more as a labor of love. If using nails, it is important to use flat-tops. If you use nails that have hardly any top to them, they will most likely only leave holes in your canvas and work against you .

Step 4:

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Be generous with nail application. This will be more effective against wrinkles and abnormal stretching. Tightly wrap the fabric around the base before hammering in the nails. Some people use a canvas stretcher for this. They most likely also have a nail gun. After applying nails across all four borders, begin wrapping the corners over themselves, keeping them tight and neat, with another seal of a nail.

Step 5:

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Make sure that the canvas feels snug and tight throughout the stretching process.This makes it less likely that there will be any wrinkles or soft spots in your new canvas. Frequently check the front of your canvas when stretching, just to keep tabs on your progress and to take care of any wrinkles when they start.