There are several factors that will affect the cost of painting the interior of your home. These include the size of the project, the condition of your walls, how much prep work is needed, the type of paint used, among others. The cost of labor and supplies ranges from $2-$5 per square foot. Additional costs may apply if you have tall ceilings or ornate trim. Your painter can help determine the best type of paints and approach for your project.
Filling gaps with a paintable acrylic-latex caulk cuts down on drafts and makes your trim look better than new. The secret to using caulk is to cut the tip smaller than you think it should be; too much caulk makes a mess. Also, instead of using a nail to break the inner seal, use a small wire so you don't stretch out the nozzle. Also consider buying a dripless caulk gun, which will automatically back off the pressure after each pull on the trigger to prevent unwanted oozing.
Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.