The white sealant on the X-15 in this 1967 photo is part of a treatment to help the X-15 deal with the high temperatures generated in hypersonic flights -- that is, at speeds above Mach 5. Underneath the white coating was an eraser-like "ablative" layer that also protected against the high temperatures. The tubes below the wing is a dummy ramjet engine, a mockup in preparation for tests that never occurred.
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