Torque stripe (torque seal) should never be relied on as an indicator that a fastener is still at full spec torque.
It should be used for only two purposes.
1. As an indicator during the build that a fastener has been final torqued.
2. As an inspection indicator that a fastener has rotated.
It is important to understand that a fastener not having rotated is not a reliable indication that it is still at specified torque.
Example - The RV-12 PAP specifies that after the first 5 hrs of flight, the landing gear bolts be re-torqued. The reason is that in situation where a highly loaded fastener is located where there is a stack up of numerous parts, during initial torquing, those parts don't always fully nest/seat on each other. A bunch of load cycles or vibration can cause them to nest together better which relieves the tension preload on the fastener. Once that occurs, it is no longer properly torqued.
This can occur with something like the engine attach bolts as well. That is why the Rotax inspection check list specifies checking for proper torque.... not inspecting to see if the fastener has rotated.
If someone is serious about checking/confirming the torque of any given fastener, the only way to really do it is to put a torque wrench on it.