What cleaning agent should be used for the final cleaning before repairing fiberglass?

For the final cleaning before repairing fiberglass, methyl ethyl ketone (MEK) is particularly effective due to its strong solvent properties. It is capable of thoroughly removing oils, greases, and residues that may interfere with the adhesion of repair materials to the fiberglass surface. MEK's ability to dissolve a variety of substances makes it an excellent choice for preparing a surface for bonding.

In the context of fiberglass repair, achieving a clean surface is crucial for ensuring that the new layers adhere properly and that the repair is structurally sound. While other cleaning agents can be effective, MEK is known for its strength and effectiveness in preparing and cleaning resilient surfaces like fiberglass, ensuring that any contaminants that could weaken the repair are adequately removed.

Isopropyl alcohol and acetone, while useful for certain applications, may not be as effective as MEK when it comes to removing more stubborn contaminants from fiberglass. Denatured alcohol, although useful for cleaning in some contexts, does not have the same solvent power as MEK and may not provide the level of cleanliness required for successful fiberglass repairs.