Smith & Co.

Smith's CPES Penetrating Epoxy

Smith & Co.

Smith's CPES Penetrating Epoxy

Product Code: VTS-592
$57.99 - $329.99

Clear Penetrating Epoxy Sealer™ (CPES) consists of a tough, flexible resin system in a solvent blend which dissolves the sap, oil and moisture found in wood. The resin system is derived from natural wood resin and develops a chemical adhesive bond to the wood fibers themselves.

The wood is strengthened while allowing normal expansion and contraction with changes in temperature and humidity. When repairing wood that has mild dry rot, the CPES will migrate along the abnormal porosity which dry rot fungus creates within the wood, as long as it continues to be fed in. Impregnation of wood with CPES changes the cellulose of wood (which fungi and bacteria find tasty and easily digestible) into epoxy-impregnated cellulose which resists further attack by fungi and bacteria while reinforcing the wood, accomplishing restoration.

Paint or varnish will last longer because the paint has a strongly attached, chemically compatible surface to bond onto.

The long working time (pot life) of these products mean they will retain their penetrating and moisture-dissolving ability for more time.

Read and follow application instructions. Keep rain or dew away from areas being treated with CPES until solvents have evaporated out of the wood. This will take at least a day and may take a week or more, depending on the extent of deterioration, how deeply the CPES soaked in and the temperatures day and night.

Application may be by brush, roller or immersion. Spraying is not recommended as a portion of the solvent component will evaporate in transit, and it is important that the product be applied to the wood in the same formulation furnished originally. When applying by roller on a vertical surface, hold the roller only horizontally and slowly roll only upwards.

Allow sufficient time for solvents to diffuse and evaporate out of the wood before applying fillers or glues. Removing paint from all sides of wood to be treated speeds solvent evaporation, as does moving air.

Warm Weather Formula or Cold Weather Formula?

We recommend the Cold Weather Formula for almost all vintage trailer work. The exception is when you are working outdoors in hot weather. The warm Weather Formula should not be used when temperatures fall below 50 degrees and the cold weather formula is not suitable for use when temperatures are in the 80s. The warm weather formula has a much stronger odor and should be avoided when working inside a trailer or a garage.


Do not use below 50 degrees. No real shelf life however must be tightly sealed after use.