You could use EternaBond tape. As far as I know, it only comes in white or black. You could cut the tape before adhering it over the crack into an arrow or some other shape to disguise it as a patch. Thinking of the blue bird shape used on their buses and Wander Lodges.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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