What should be checked on fabric before applying the first coat of sealer?

Before applying the first coat of sealer on aircraft fabric, several factors must be checked to ensure the proper adhesion and effectiveness of the sealer.

First, surface cleanliness is crucial. The fabric surface must be free of dirt, oils, and other contaminants that could interfere with the bonding of the sealer. Any debris or residues can lead to poor adhesion, resulting in coating failures or reduced protection against the elements.

Second, color consistency is checked to ensure that there are no discrepancies in fabric dye, which can affect the overall appearance of the finished surface after sealing. Inconsistent coloring can raise concerns about patchwork repairs or uneven application of subsequent coatings.

Lastly, fabric tightness is an important factor to check. The fabric should be properly taut on the aircraft structure to prevent future issues such as sagging or wrinkling once the sealer is applied. Loose fabric can also compromise the structural integrity of the aircraft and may not allow for even application of the sealer.

Thus, all of these aspects—surface cleanliness, color consistency, and fabric tightness—are essential to verify before the initial application of the sealer, making the answer encompassing everything necessary to ensure a quality finish.