We currently have an issue with filling the gap between our window and frames using low adhesion sealant PR-1428, Class A. The sealant is runny and hard to keep in place for forming. The assembly must be pressure tested so complete sealing is required. I'm thinking about using another low adhesion sealant MIL-S-8784 Class B. It looks to hold after forming much better but we have never used it before. Does anyone know about MIL-S-8784 Class B if it will hold pressure or if there is a better solution for our current sealing issue? Thank you for the help.
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