Did you know there are different types of primer?
For interior walls & ceilings, use a pva primer on raw sheetrock (sheetrock that has never been painted before). You can also use a "flat" latex paint as your primer if you want. This works just as well. Use 1 coat of primer then 2 coats of your finish paint over that.
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If you want to go a less expensive route, you can have your primer "tinted" to the same color as your finish paint then you could install 1 coat of your finish paint in lieu of 2 coats of finish paint. The finished surface is less durable than installing 2 coats of finish paint though & you can get the overall same effect. This type of application works the best if you are using a flat latex enamel paint for your finish coat.
You could do this same thing if you were using a semi-gloss latex interior paint for your finish coat but I would recommend using 1 coat primer & 2 coats semi-gloss finish paint over new sheetrock so you get a good coverage as the 1st coat semi-gloss will soak into the prime coat & your overall wall surface could look splotchy or look like you installed a satin or egshell finish rather than a semi-gloss paint finish ( ie. for when you are painting bathrooms & kitchen areas).
For interior water stains,ink marks,etc., you will need to use a different type of primer material or else the water stain & ink marks will bleed right through a regular primer. You can "spot prime" these areas using a primer product called "kilz". This material works great. There's two types of "kilz" primer products. One is really smelly & the other is not very smelly at all so look & make sure you read the labels before you decide which one you want to use.
Also, one you clean up with water & the other with mineral spirits. I prefer the water-based product (the not so smelly one). You get this material in gallon containers. You can also purchase the "kilz" in a spray can for those small areas (if you don't need a whole gallon). The spray cans come in both varieties as well so "read the labels" as you don't want to stink everyone out, especially if you are working anywhere near the public.
Paint stores also carry a variety of exterior grade primers as well. Don't be bashful on asking all the "dumb" questions to the store attendant as no question is "dumb" when it comes to painting. Hopefully you are gaining the knowledge you need by reading these blogs, in order to do all of your own painting projects so you can save,save,save! You'll get a great feeling of accomplishment when you know you can do it yourself.
That's the goal here........that I teach & share with you what "you've always wanted to know about painting your own projects but were afraid to ask"!
Confucius says: "I hear (read) & I forget....I see & I remember....I do & I understand"
Now start "seeing & remembering" and: "Click here to get your free painting video tips"
Next time we'll talk about "spackle" & when you should use it & when you should.....not....use it.