Childers CP-10 White Mastic

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(3 reviews) Write a Review
Price: $43.74

VI-CRYL CP-10 weather barrier coating is a tough, durable, and fire-resistive water based mastic for most types of thermal insulation and finishing/insulating cements. It is very thixotropic - it looks heavy but spreads easily.  This thermal mastic is outdoor rated and U.V. resistant.

Childers CP-10 weather barrier coating is unsurpassed for the mechanical protection and weatherproofing of thermal insulations both outdoors and indoors, in hot, cold, and dual-temperature service. However, since it is a ‘breathing’ water-based mastic (vapors under pressure will pass through it) it should only be used over insulations in low temperature, or dual-temperature service when the insulations themselves are vapor barriers (Fiberglass Pipe's ASJ paper is a vapor barrier). VI-CRYL CP-10 water-based mastic has also found use throughout the thermal insulation industry as a coating used over closed cell polyethylene and polyurethane foam insulations.  

*Note from Buy Insulation Products - Childers CP-10 and CP-11 thermal mastics are great for sealing up insulation on chilled water systems. Use CP-11 water-based mastic to seal up all exposed fiberglass, paint any tape seams and SSL closures to prevent condensation buildup on the pipes.

* CP-11 can be painted on with a chip paint brush while CP-10 is applied with a trowel


  • 5
    Does a nice job

    Posted by Matt Y. on 4th Feb 2019

    I have used this item for various insulation work.
    I normally used a putty knife and had good results

  • 5
    Works well

    Posted by John F on 7th May 2016

    After using the rewettable fiberglass cloth to encapsulate the asbestos insulation on my heat pipes, I applied this mastic for extra protection. As another viewer indicated, it is easiest to apply by hand after putting on latex gloves. I didn't bother with the brush since I was able to smooth it by hand, smoothing toward the area that had not yet been coated. It comes out quite smooth if you are careful.

  • 5
    Easy to apply. Does the job.

    Posted by Unknown on 25th Mar 2016

    I have old steam pipes in the basement that are insulated with asbestos. I did not disturb the asbestos and covered it all with rewettable canvas pipe lagging. After the lagging cloth dried I used rubber gloves and applied the mastic by hand. With a little practice I was able to achieve a fairly smooth surface and then lightly brushed over it with a wide paint brush just to make the surface look a little more finished. It looks good. It is paintable, but it also looks fine in white without painting it.