Step 8Attach the valve to the canvas strip.
Speaking of making things as airtight as possible, now would be time to seal the part of the fabric that you are going to attach the swimmie to. Trace the outline of the cut swimmie onto the part of the fabric that will later become the inside of the inflatable heart. Over this outline paint two coats of latex to help in making this canvas frame airtight. For instructions on painting with liquid latex see the Coating Fabric with Liquid Latex instructable.
Sew a series of rings around the valve from smaller to larger (see picture).
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