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Top ten questions that scientists can't answer.

Monstrous Nightmare

I am just writing on my fanfic and something gave me to think. A monstrous Nightmares hide is covered with a burnable gel so that they can ignite themselves. Good-but what if the skin of a Nightmare was hit by a fiery attack from another dragon? Would it not ignite the gel too? Hookfangs skin for example is producing this gel permanently I think, when I saw the riders harvesting it-and its a lot. So every time Hookfang got a hit from other dragon fire, his hide is always in danger to ignite itself completely or partly. What do you think? Or could he steer this somehow? Its a bit suspicious for me.