I would have thought mineral build-up, as well, but that is strange it is only on the perimeter. Could it be coming from the walls? A co-worker of mine covered a stain in her grout with a colored grout sealer. You could check with a flooring company or home depot/lowes like store to see if they have a colored sealer that would match your grout. She said the best way to apply grout sealer is with one of those plastic mustard or ketchup containers because the pointed lid is the perfect size for grout.

If your topcoat is a dark beige/light brown, then 2 coats of that should cover most anything quite easily. Skip the extra primer coat.

ranger, A bit of clarification... Cardinal currently has three versions of HSHG coatings - LoE-178, LoE-179, and LoE-180. LoE-178 and LoE-179 are being phased out and LoE-180 will be Cardinal's only HSHG offering in the very near future (I believe that 178 may no longer be available). LoE-180 has a SHGC of .69, a .24 U-value, and VT of 80% when used on surface 3 of a dual pane IGU (3mm glass). But keep in mind that these numbers are for glass only and they will be different when the glass is installed in a window system. The LoE-180 is a single-silver softcoat and as a softcoat it has to be installed between the lites of an IG - it cannot be exposed or it will corrode and fail. LoE2-270, LoE2-272, and LoE3-366 are also softcoats, but 270 and 272 are considered moderate solar heat gain and 366 is considered low solar heat gain. Coatings 270 and 272 have two layers of silver and 366 has three layers of silver in the coating. Notice a pattern here? LoE-180, 270, 272, and 366 have to be installed inside an IG to protect the coating. Recently Cardinal introduced LoE-I81 which is a hybrid between soft and hard coatings. It has softcoat performance but can be used in traditional hardcoat applications. LoE-I81 is designed to be used as a surface 4 coating. Surface 4 is the glass surface that you can touch inside your home. LoE-I81 is designed to be used in conjunction with a softcoat on IGU surface 2. In an IGU, in combination with (for example) LoE3-366 on surface 2, and with argon gas infill, the IG will have a .20 U-value. A .20 U-value is more indicative of triple pane performance with Low-E coatings on two surfaces than with a typical dual pane. The intent of I81 is to increase U-value performance in dual pane IGU's to near triple pane U-value performance levels. Using LoE-180 on surface 3 and I81 on surface 4 would be a dream for the combination of HSHG and low U-value, but that make up is not currently avaiable (technical challenges), so in order to have I81 on surface 4, surface 3 will not be coated. On your southern exposure, if you want the maximum solar heat gain available while still using a Low-E coating, then you want to use LoE-180 on surface 3. For the other windows in your home using LoE3-366 on surface 2 and I81 on surface 4 will result in the highest glass U-value performance numbers currently available in the industry. You can also specify LoE2-270 or 272, but the U-value will drop off a little bit when compared with LoE3-366. And one final point of clarification - Cardinal's Low-E nomenclature will tell you the number of layers of silver in the coating and the VT of the coating in an IG unit consisting of two layers of 3mm glass with one glass lite coated. So, LoE-180 has one layer of silver and 80% VT. LoE�-366 has three layers of silver and 66% VT. Also the "2" in LoE2 is really supposed to be LoE "squared" and the 3 in LoE3 is supposed to be "cubed", but THS doesn't allow superscripting.

Hold off!!!! If you're anything like me you're just not use to the immediate change. I would wait 2-3 weeks before painting again. The color may grow on you. When I redid my bathroom I went from burnt orange color to light gray. The gray looked like primer. I HATED it... But slowly overtime the color grew on me, and the bathroom got remodeled, so it all came together.. But I did the same thing you did - painted and freaked. I almost went to the paint store to get something a couple shades darker but my husband told me to wait. Also, my living room area is a very pale yellow color. My house had faux ugly brown trim and I replaced it with white trim, and painted all the doors. As soon as the new trim went in, I HATED the light yellow wall color. I thought it clashed with white.. Well I waited, and months later the color grew on me.. Now I love it... Give it some time. Seriously.