If you see these signs, remove the old sealant, pull out the existing Devfoam (use a hook tool), and redo the process. Do not simply cap old sealant with new—this creates a weak layer.
De-foaming is essential in various industries to prevent foam-related problems, including: devfoam crack work
Colloidal silica (Aerosil/Cab-O-Sil) for structural strength, or glass bubbles (microballoons) for lightweight, sandable fairing. If you see these signs, remove the old
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: This is a measure of the material's ability to withstand pressure without deforming. For crack work, especially in areas that might be subjected to traffic or other loads, high compressive strength can be a valuable feature.