Tech Questions - Covering Plywood
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- How should I prepare a large plywood surface for cover?
- What about attaching the fabric?
- Do I need to heat tauten the fabric after I have it attached?
- What holds the fabric to the plywood if I can't rib lace or attach it in any other way?
How should I prepare a large plywood surface for cover?
Varnish the entire area using EV-400 Epoxy Varnish. Do not use anything other than an epoxy varnish. Brush or spray at least 2 coats on the surface. Allow the first coat to dry to the touch before applying the second. The next step is to apply Poly-Brush. After the varnish has thoroughly cured, you should brush on one coat of Poly-Brush that has been reduced 3 parts of Poly-Brush to 1 part of reducer. Allow this coat to dry. Then spray on a second coat of Poly-Brush.
What about attaching the fabric?
You will attach the structure using Poly-Tak cement. This means attaching it on leading and trailing edges, wing butt ends, etc. Do not use Poly-Tak to apply the fabric onto the surface of the plywood itself.
Do I need to heat tauten the fabric after I have it attached?
Definitely. You will heat tighten using a household iron starting with a temperature of 225 degrees F. You then will increase the temperature to 250 degrees F. This is the final setting for heat shrinking over plywood surfaces.
What holds the fabric to the plywood if I can't rib lace or attach it in any other way?
As you know, the fabric must adhere to the plywood surface. This is particularly important on a lifting surface such as a wing. Poly-Brush is applied over the fabric which then penetrates through the fabric activating the Poly-Brush you have applied directly on the plywood. Be sure you brush this coat of Poly-Brush onto the fabric. After this step you follow the remaining steps in the manual.