microsealcoThe Microseal Company (a division of Microleak-Seal Impregnant, Inc.) began in 1962, the invention of chemist Albert Jager, PhD, who created the product while working as as chief metallurgist at an aluminum factory in Utrecht, Holland in 1947. One day, he received a complaint from a customer regarding porous metal castings. If the customer was forced to remelt and recast it, it would have been enormously expensive. Seeking a simple yet inexpensive, complete solution to the problem, Mr. Jager invented the product overnight that would become Microseal.The Microseal Company is now located in the beautiful upstate city of Rome, New York and remains a family-owned business to this day.Our product line includes Microseal-AC (an acetone-based product), Microseal-MEK (a methyl-ethyl-ketone-based product) — both available in single- and double-strength formulas — and Miniseal (our water-based product).


Microseal seals porosity in all metals. Its consumption ranges from 500 to 2,000 sq. ft. per gallon depending on surface conditions. Its shelf life is unlimited if containers are kept well closed and excessive contamination by water, lubricants, and fine metals is avoided.

Containers for storage or dipping should be made of tinplate, enamelled iron, aluminum, stainless steel, ceramic, glass or plastic (polyethylene). Do not use plain steel (mild steel) or galvanized containers as prolonged contact with these may cause the sealant to jell. When not in use, containers should be covered to avoid evaporation losses.

Microseal which has thickened due to evaporation can be thinned by adding methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK) or acetone. Hardened Microseal dissolves in these solvents.


Microseal consists of resins in a ketone solution and is used to seal porosity in all metals. It can be dipped, brushed or sprayed on to penetrate the pores. The solvent then evaporates leaving the pores sealed with resins.

Microseal is available with either of two solvents: Acetone or Methyl Ethyl Ketone (MEK). Unless otherwise specified by the customer, Acetone based Microseal is provided, the reason being that VOC/EPA regulations favor Acetone over Methyl Ethyl Ketone.

The following is a list of available Microseal products:

Microseal-MEK: Methyl ethyl ketone-based normal strength Microseal.

Microseal-AC: Acetone-based normal strength Microseal.

Microseal-DS-MEK: a double strength Mek-based Microseal which is used for coarser porosity and for bonding and locking applications.

Microseal-DS-AC: Acetone-based double strength Microseal, also used for coarser porosity and bonding and locking.

NOTE: Wherever the term “Microseal” is used in this site, it refers to both Acetone- and MEK-based products, unless specified otherwise.

Miniseal is a silicate material with penetrants. The solvent is water so the seal needs baking to become water resistant. Miniseal is generally used where the metal comes in prolonged contact with ketones and/or when the metal will be exposed to temperatures above 350° F. (177° C)