I thought if the panels were bonded tight the skin would not float with temp change which may cause it to show flex/wave at the adhesion points ?

3m Urethane seam sealer part number 08361.

IT EXPANDS 10 TIMES SIZE, NOT PRESSURE EXPANSIVE. IT IS DESIGNED FOR THIS. ONE DROP ABOUT THE SIZE OF A PEA WILL EXPAND TO ABOUT THE SIZE YOU WANT. IT WILL TOUCH THE HOOD SKIN, THEN EXPANDS OUT. IT IS NOT EVEN IN THE SAME UNIVERSE AS GREAT STUFF.
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Lord Fusor 121 Flexible Foam (Super Fast)


Lord Fusor Flexible Foam (Super Fast)


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Lord Fusor Flexible Foam (Super Fast)

Applications

Sound deadening, sealing and filling of: door skins to crash bar, hood panel to supports, trunk panel to supports and gas tank filler area.

Substrates

Primed or painted metals and all plastics.

Features & Benefits

Matches OEM sound deadening foams
Retains its memory with no shrinkage
Expands to 10 times its size
Will not oil can
Will not absorb moisture or cause corrosion
Available in 50 mL or 300 mL cartridges

Product Usage Instructions

MSDS Part A