Identification of the specific area of porosity in a casting that causes a leak is vital information for the foundries to make improvements to their casting process and at the same time allows 'localised' impregnation to be carried out, resulting in greater efficiencies and much lower costs. Conventionally, impregnation has been undertaken by total immersion of large baskets of castings in sealant in a vacuum and pressure vessel followed by washing off the excess sealant in cold water, before curing the castings in 90°C hot water. This treats the part in its entirety, rather than simply targeting the specific area of porosity and is consequently wasteful of chemicals, water and energy.

Localised Impregnation eliminates the need for large capital investment in conventional equipment and significantly reduces the cost to recover leaking castings. Savings of over 90% compared to conventional impregnation equipment are possible. The risk of sealant contamination in threads, oil ways and other internal galleries and of corrosion and discoloration of castings - common problems experienced with impregnation equipment to date - are also removed. Part assembled castings can be sealed using localised impregnation, which is not possible through conventional equipment. Localised Impregnation also enables a higher recovery rate of leaking castings to be achieved compared to conventional equipment. A recovery rate as high as 100% is common as a result of a number of factors including the ability with Localised Impregnation to tailor the sealant to the type of porosity on a part-by-part basis. Significantly, there is no wash-out of impregnation sealant from the porosity during conventional washing and curing, resulting in a better quality seal.

Bench-mounted and automated systems are also available for volume production.