naval jelly

[t3]

one of my commercial customers has started applying naval jelly to the ends of the evap coils to reduce rust colored runoff on some business properties.

on a couple buildings they started having the runoff from the drainline cause a discoloring of the exterior walls (units sit on 2nd floor) and on units at street level, the drainline discolors white concrete.

the units are high-end trane package units (5 ton with dual compressors)

this stuff
http://www.loctiteproducts.com/products/detail.asp?catid=13&subid=47&plid=169

he brushed the surface flat ends of the coils and then rinsed the area and I must admit it took off the rust nicely. what I don't know is if this will reduce the life of the coils but since I get a substantial volume of new installs and maintenance from this particular business would like to ask if there is any downside to applying naval jelly in this manner? I don't want to upset or lecture the customer if there is no harm but if naval jelly reduces the life of the coil or causes any health issue I would like to tell them.

[troyorr]

Naval Jelly by Loctite does contain phosporic as well as sulfuric acid. Also contains alcohol. Make sure the rinse water contains a base that will neutrialize the acids. The surface needs to be sealed after use or oxidation will reappear quickly. Repeated use will eventually eat through the coil. Have your customer clean, neutrialze and then coat the coil for longer life.

[hvaclover]

Eh, I carry a tube of Vaseline petroleum jelly in my tool bag to help pull blower hobs.

Also use it to lube shaft on replacement blowers . Wouldn't be with out it on my anal inspections.

[marvin]

i have done this in the past but after a real good rinse
sprayed the ends with the dry graphite spray from napa
auto parts. holds up real well & looks real good.