I painted the engine compartment of my LT-40 with Butyrate based paint, then when covering made sure to lap the covering around the edges and into the engine compartment slightly. When the covering was ironed down the Butyrate paint under it melted slightly and sealed down the edges. I've certainly never had any problems with edges coming loose in the engine compartment and it's three years/100+ flights now

Cheers,
Neil.