Steam Boiler leaking water onto burners

My boiler has started leaking water onto the burners. It doesn't happen when boiler is cold and isnt a continuous leak. it appears to happen when the boiler pressure and heat builds up, like a back flow. Its not enough to distinguish the flames or pilot but is enough to cause a lot of hissing and occasionally extinguish the pilot light.



Will a liquid sealer fix this type of problem temporarily?

Steam Boiler leaking water onto burners