Be careful with Zinsser Shellac as a spot primer. It can flash under your topcoat which means you will see a bright spot under the topcoat and not under the rest of the wall. Professional painters use shellac to prime rooms that have been damaged by fire, have tough grease or glue deposits on walls, or to cover concrete floors that have been exposed to urine, etc because it cancels out bad odors. Zinsser has an oilbased product called "Coverstain". Make sure your state is alkyd compliant and still sells it. Home Depot also sells oilbased Kilz which has been modified for VOC regulations and will block water stains on plaster and drywall. It dries in an hour and can be topcoated with any latex/acrylic paint.

I agree with paintguy. Acrylics increase their adhesion with time. What scraps off after 2 hours may well be adhered after 2 days. As to Behr paints, I have personally made test samples of Behr Ultra, Marquee and WB Alkyd over sections of hard, slick, high gloss oil paint. I hand these to customers and defy them to scratch it off with their fingernails. They are wearing thin with literally hundreds of tries, but they are still intact! Wanting to see the worst case scenario, I did not sand or de-gloss the oil paint. I am an old school painter, raised on oil pains and somewhat of a doubting Thomas. I have become a believer. If someone's paint is "balling up", I would wonder what is on that surface? Was it cleaned of oils from hands or other pollutants?

Gripper gripper gripper! Wins over every product for wood, drywall, metal... Glidden does horrible job of promoting this product. Would not use other if u give it to me. I tint is to color of my finish paint and eliminate needing 2nd coat of paint over the primer. Have used 100's of gallons of this stuff. Has a slight sheen like a satin so I use 2 coats of it for my rentals with no final paint coat. Easier to clean up and only 1 coat needed when tenants move. Feather brush areas with dark marks or water spots when needed to report bad areas. Comes in premixed grey for foundations porches... but must order it as none of the box stores stock it any more. Glidden is Home Depot product rather than Lowes.

Tips from Good Housekeeping Undo water damage: On a wood table, water spills, wet glasses or vases, and hot dishes can leave behind unsightly white marks and rings when the moisture seeps into the finish. Fortunately, unless you've had a spill linger on the surface for a long time, this damage can be repaired quickly. Start by placing a clean, thick towel on top of the stain. With your iron on a dry low-to-medium setting, press over the towel (making sure the soleplate doesn't touch the wood) for several seconds. The gentle heat will warm the finish enough to release the moisture into the towel. Lift the towel to check the results. Repeat as needed until the stain disappears. Polish and buff as usual. Bonus: How to avoid further damage in the future:Place trays or trivets on the coffee table to hold drink glasses. Because they're bigger than coasters, people are more likely to use them. Also consider Guardsman's Water Ring Remover Cloth ($5; guardsman.com). It rubs out water — and even perfume — stains. And keep scratch-cover marking pens handy.