It isn't necessary to paint or "seal" the aluminum. It will be fine just the way it is now.

On any gasketed surface with these small two stroke engines I use no sealer at all. It's not necessary if the gaskets are good, and small bits of sealer can get into the carb pulse port, the spark plug gap, etc., so I don't recommend using sealer. The only time I use it is on some engines I leave out the base gasket to lower the cylinder for more compression and then I do use Yamabond in place of the gasket. It won't hurt though to carefully put a very thin layer of Yamabond on one of those crankcase halves of that Poulan.

Now that the prices have dropped to only around 45 bucks for electronic ignition, it is hard not to go that way and enjoy the benefits of lighter weight, more power, better idle, and easier starting. Try www.rcextremepower.net to have a look at the prices. They have an automatic advance on the timing that makes the engine start and run much smoother.

AV8TOR