Hot Topics: Can You Use a Garden Sprayer to Apply Concrete Sealant?
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If that next project is to seal your concrete driveway or paver path, you are in luck! This week's "Hot Topics" looks at how to apply concrete sealer to a large area. Will a garden sprayer work, or do you need something more powerful? Our DIY experts have the answer.
Original Post: Can I Use a Garden Sprayer to Apply a Solvent-based Concrete Paver Sealant?
the title may sound a little odd, but I have a need for a one-time use sprayer to apply a solvent-based concrete sealer to my concrete paver-stone driveway. The company that recently did some repair work on it said they use the standard garden-type pump sprayer, and usually get a few uses out of them, so I'm considering doing the same thing. I plan on only applying one coat and should be able to do the whole thing in a few hours. The manufacturer recommends a sprayer followed up with a foam roller to apply the sealant, but chemical-resistant ones cost a fortune.
The sealant I'm going to be working with is this:
Highlights from the Thread
marksr Forum Topic Moderator
A pump up garden sprayer should work fine. You'd need to use a solvent to clean the pump when you are done. Normally that would be mineral spirits, but I see on the tech sheet where they say to use lacquer thinner. Lacquer thinner would be hard on any plastic parts or seals, which is probably why you were told the sprayer only works for a few applications.
Back rolling is important! It will work the coating into the substrate instead of just laying on top, which means it will last longer, and it can also even up any unevenly applied sealer. I've never liked using foam rollers and would use a lambswool cover. I suspect a cheap foam roller would dissolve in the sealer.
I've used cheap garden sprayers for years to apply concrete sealers. And I've cleaned them for years using nothing but pure lacquer thinner, all without problems. I think the trick is to not let the lacquer thinner stay in contact with plastic or rubber parts for any length of time. I always blow-dry the entire assemblies with compressed air when finished to make sure no residual lacquer thinner is lurking in the guts of the sprayers.
Do you have to modify the nozzle to accommodate the more viscous sealant?
Clogged nozzles have been my only complaint with garden sprayers (and one time I let water in the nozzle freeze).
marksr Forum Topic Moderator
There is a limit as to how thick a coating can be sprayed through a pump up garden sprayer. Since I own two airless pumps, I've never used a garden sprayer to apply any paint/stain. Though I have run a little mineral spirits thru the garden sprayer if it's going to set for a long time (to dispel any water), I've never put any lacquer thinner in one.
If the nozzle clogs, you basically need to clean it with some thinner. The faster drying stains/sealers will dry in the tip quicker than others. I've run into the same thing with conventional spray guns - the air that passes thru the tip also tries to dry the coating that is coming out of it.
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