Using latex over oil based paint has mostly been viewed as a no-no, and for excellent reason. Just taking a quick glance at the picture for this blog write-up will certainly give you an concept of what will certainly happen every single time you execute. Well...possibly not eextremely time.

So just how carry out you recognize when it"s safe to usage latex paint and as soon as it must be avoided? That will be the topic of conversation for this week"s blog write-up, but before we get into all of that, let"s look at why a homeowner could choose to usage latex rather of oil in the first area.

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Latex vs. Oil


Oil-Based Paint (sometimes referred to as "alkyd-based" as soon as fabricated resins are used) generallyadheres very well to surencounters because of it"s slower drying time, is exceptionally resilient, and also stain-resistant. The drawbacks to oil finishes are that they frequently have actually an extra pungent odor and better VOC content, are messier to work-related via and cleanup, do not retain their shade and also gloss and also latex, have the right to "yellow" and also even come to be brittle as they age.

Water-Based/Latex/Acrylic paints are more popular because they"re much easier to job-related through and also clean-up, they last longer, retain their color and also gloss better than oil, normally have actually an extra tolerable odor, and in many instances they dry quicker to the touch. Latex does have it"s cons, in that it lacks the durcapacity of oil in many type of cases, doesn"t mainly adhere as well due in part to the much faster drying time, and it shrinks as it dries which deserve to reason previous coatings that are not well-adhered to the surchallenge to prematudepend fail.

When Should You Use Oil?

Oil-based paint is a safe option as soon as paint over a previous oil finish bereason it is more foroffering of marginal surchallenge prep so tright here is less possibility for peeling -- however that doesn"t expect you should skip out on surconfront prep altogether.

When you desire an extremely smooth painted surface -- such as on inner doors, home windows, and trim -- oil is a great choice bereason it has actually self-leveling properties that will certainly alleviate the appearance of brush marks and roller stipple, leaving you with an elegant look.

In applications that call for an extremely sturdy finish, as opposed to latex, oil based paints are great at resisting abrasion, scratching, scuffing, and simply general abusage. Outdoor steel furniture, steel handrailing, and various other similar surencounters are excellent examples of instances wbelow homeowners like its use.

Oil-based primers for use on bare wood are more than likely my extremely favorite application because they administer benefits that no latex product deserve to come close to matching. If I"m re-paint exterior hardwood clapboard siding, I"ll constantly have actually a have the right to or two handy to use as a spot primer because of its impressive capacity to bond to bare hardwood.

A couple of situations where I attempt to avoid making use of oil products are as soon as I"m paint a huge inner surface, choose wall surfaces or ceilings, sindicate bereason it"s many frequently not vital and also I don"t prefer to deal with the odor and also the cleanup. I additionally choose to steer clear of them when I"m re-painting large exterior surencounters, such as the siding on a residence, bereason I recognize that it won"t hold up as lengthy as an acrylic-latex between re-paints.

When Can You Use Latex?

It"s mainly excellent practice to usage latex over previously-painted latex on any surdeals with that expand and contract. Latex paint films are versatile and they move through the surfaces underneath of them, so if I apply a non-functional coating (which oil is) over a functional one I"m going to finish up via concerns that you would mean -- namely cracking, alligatoring, etc.

Latex paints (specifically 100% acrylic paints) are the go-to assets for exterior residence re-paints because they retain their color and gloss a lot longer when exposed to the sunlight. One case where caution need to be offered when re-painting via latex is when it"s being applied to an older residence that has actually many layers of paint. The problem lies in the means that latex dries as opposed to oil. Oil-based commodities dry via solvent-evaporation and oxidation, whereas latex dries by solvent-evaporation and also coalescence. Those terms don"t necessarily suppose a lot to the average homeowner, however what is essential to you to understand is that latex paint shrinks as it dries. So if you have old previous coats of paint that are likely marginally adhered to the substprice -- at leastern in some spots -- your brand-new latex paint have the right to actually pull them off of the residence as it dries.

So How Do You Repaint Over Oil With A Latex Paint?

If you"ve made the decision that a latex topcoat would certainly be ideal for your instance, what are the measures that have to be taken to ensure that it will certainly last?

Clean the surconfront - Similar to any paint job, you need to rerelocate any dirt, grease, and also contaminants from the surface with an excellent high quality degreasing pre-paint cleaner. If this is the exterior of your home and also you arrangement to pressure-wash the surchallenge, you can usage the chemical injector tube on your pressure washer to use the cleaner to the surface. Let the surconfront thoroughly dry before you move on.

Scuff It Up - With a difficult coating prefer an oil-base end up, it is good practice to abrade the surconfront through sandpaper, or an electric sander, to create a profile for the brand-new paint to stick to. After you"ve sanded, be sure to rerelocate the dust from the surconfront by wiping it down via a damp rag or tack towel, or rinse it off through a garden hose or press washer if the project is a large exterior surconfront. Allow it to dry before proceeding to the next action.

Prime It - Even after scuff-sanding the surface it"s a great principle to include an added layer of insurance that the latex will bond to the oil by applying a coat of an adhesion-promoting primer that is proper to the case that you"re functioning in (interior, exterior, and so on.)

Apply Two Coats of Your Finish - Using your strategy of alternative (brush and also roller or airmuch less sprayer) use 2 complete coats of your favorite latex topcoat that"s appropriate to the situation. If it"s an exterior task, select a high quality 100% acrylic paint via a great warranty.

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How Do I Know If It"s Oil Or Latex?

A easy test you deserve to do to recognize whether you have actually a latex or an oil complete on your home is to purchase some denatured alcohol, which you have the right to discover at your regional hardware store. Apply some to a clean cotton rag and rub it strongly throughout the surconfront.

Look at your rag. If you view paint on the fabric that was removed from the surface you need to be taking care of a latex. Denatured alcohol will certainly cut and also remove latex but not oil based paint.