When a manufacturer claims that their paint is a paint and primer in one, all they are promising is that you can use that paint as the first coat over drywall or a previously painted surface that is clean and in good shape other than a few ordinary repair materials like spackle or putty.
These paints can not normally be used a s bridge between oil and latex paints. For these applications, and any other application other than a simple repaint, a specialty primer should be used.
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Behr makes 'Premium Plus Interior/exterior oil based primer/sealer'. In a blue can in Home Depot.
Yes you can, as long as the red finish paint is compatible with the tan wall. Acrylic and latex paints can't be applied over an oil based paint without a primer. A tinted primer can be used if you are not sure. Plus, a tinted primer will make the red paint cover better.
Behr thinks so, I believe they are correct. I've used both. Try a blind paint test. Pour out some Behr Premium Plus Ultra and some Sherwin Williams Duration. Have someone roll both on a white primed piece of drywall. Watch the coverage. It's visually distinct. Behr wins hands down. Now try Behr Premium Plus and Sherwin Williams Pro Mar 200. Now you really see the difference. I've used both on my rental properties. Behr allows me to save money and time. Fewer coats are needed. The pealing exterior window frames cover well with Ultra paint and primer in 1. The paint shell that follows after drying is hard and durable. So far one winter shows no sign of degrade, fading or discoloration. Home Depot's pricing .is remarkable less than the Sherwin Williams. Unless I receive some stimulus to buy other paint- Behr is all I will buy
Besides a few shades of black, white primer will reflect more light back than a gray primer under a paint color that doesn't cover well. Gray is often used under dark reds which would normally require several coats of paint to cover, The lighi that would normally be reflected from a white primer underneath the paint is, instead, absorbed by the gray primer, giving the illusion of an opaque surface. White primer is used under any light paint that covers well. It can also be tinted to the color of many off white or pastel wall colors to help ensure coverage using fewer coats.
High gloss Exterior Oil-Based Gloss Enamel over Quality Primer will give the best results on a cornice.
Latex paint can be used as a primer but the results may not be what you want. Primer is less expensive than latex paint and has special qualities that create a seal and help the finish layer of paint adhere better. In the long run you will save time and money by using the correct product for the job.