What must be done before repairing tears in fabric?

Question

BlackTom AI · Accepted Answer

Fabric-covered structures are repaired only after all surface finishes that would prevent a secure, continuous bond are removed down to the clear dope. Clear dope is the transparent lacquer used as the base film that adheres to the fabric and provides a proper surface for additional dope layers and patching materials to bond. Key concepts are adhesion, film continuity, and removal of surface contaminants or pigments that interfere with chemical and mechanical bonding.

Step-by-step reasoning:
1. Inspect the tear to determine how far the damaged fabric and finish extend and to locate any areas of loose or deteriorated film. Cut away any loose fabric and frayed edges to sound material.  
2. Remove surface finishes (paints, pigmented dopes, varnishes) in the repair area. This must be done until the clear dope layer is exposed because pigmented or metallic finishes (for example aluminum-pigmented dope) create a discontinuous or non-adhesive surface. Metallic pigments prevent penetration and mechanical bonding of new dope layers and adhesives.  
3. With the clear dope exposed, apply new fabric patching and successive coats of dope which will properly wet out, adhere, and shrink to restore strength and smoothness. Finish coats and coloring are applied only after the structural repair and base dope layers are properly bonded and cured.

Why the correct choice is correct: Removing finishes down to the clear dope ensures the new dope and fabric patch chemically and mechanically bond to a compatible base film; this restores the load-transfer and sealing functions.

Why the other options are incorrect:
- “Put on a patch over blue paint” would place new material over a paint film that blocks adhesion and can hide continuing deterioration.  
- “Remove the paint but not the aluminum pigment” leaves metallic particles that inhibit proper bonding and film continuity.

Therefore, the correct action is to remove the finishes down to the clear dope. This matches the provided answer.

What must be done before repairing tears in fabric?单项选择题

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