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Pool Shell Densifier – SD400

A non-hazardous, user friendly, permanent densifing/hardening sealer that waterproofs and prevents efflorescence on new and existing concrete pool shells and raised walls.

SD400 is a multi-phase penetrating lithium-colloidal based proprietary silicate treatment that reacts with concrete to produce insoluble calcium silicate hydrate that locks aggregate together and fills vacant concrete pores while building a water-resistant matrix. SD400 is an effective solution for preventing water seepage and efflorescence in concrete.

SD400 is faster and easier to apply than other pool shell protection products – it can be applied with a pump-up sprayer and in addition, SD400 eliminates the need for the pool owner to water the shell surface (hydrating) during its initial curing stage.

For more information regarding this product, please download our Data Sheet & Application Guidelines.

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Application Highlights


  • Gunite Pools
  • Raised Walls
  • Shower Pans


  • Full cure 48 hours
  • May slightly darken
  • Apply two saturation coats wet on wet
  • Safe, easy to apply


  • Typically outdoors
  • Horizontal and vertical


  • One-gallon bottles
  • Five-gallon pails

Regulatory Compliance: VOC Compliance; This product is compliant with the following national, state, and district AIM VOC regulations, US environmental Protection Agency, California Air Resources Board SCM Districts, South Coast Air Quality Management Districts, Maricopa County AZ, and Northeast Ozone Transport Commission