Oil and water should be used for the use of Polyurethane.
Oil and water repel each other and don't mix.Luckily, there are ways to apply finishes.If you decided to go for an oil-based finish, don't worry.You can apply the oil-based finish right over the water based one with a little bit of extra time and preparation.
Step 1: The water-based coating needs to be cured.
If you apply the coating yourself, read the can for the curing time.It is usually between 30 to 60 days for some brands.Wait 30 to 60 days if you don't know if it's cured.The surface is not dry if it is cool to the touch.It is ready to go if you sand it lightly and get a fine powder.
Step 2: Use sand paper to buff the old finish.
Pick something that is around 150-grit.You can use a power buffer.You don't want to cut through the water-based finish if you use a light touch while buffing.
Step 3: You should thoroughly clean your workspace.
To clean larger surfaces, wipe them with a dry cloth and vacuum them.The floor needs to be vacuumed to get rid of dust.
Step 4: Clean the surface with a cloth.
A damp with mineral spirits will work best.You can use a tack cloth.It will get rid of any dust that may mar your final finish.
Step 5: Make sure that you have enough air.
This is important.You will be working with chemicals as well as sanding and dust.If you can't take your project outside or into an open garage, open a window.
Step 6: You should put on a respirator.
It needs to be rated for organic fumes.It will help protect your lungs from harmful dust and fumes.
Step 7: The room should be dust-free.
You have to clean the room and the work surface.If you have a tapestry in the room, it would be a good idea to take it out temporarily.You don't want to see dust in the room.
Step 8: If you want to use half or full strength, you should make a decision.
It will act like a wiping varnish if you use it at half strength.It is easier to sand.If you want to use it at half strength, you need to add paint thinner.
Step 9: If it's necessary, add the polyurethane.
Purchase two cans.To use later layers, set one of the cans aside.Put equal amounts of paint thinner in the remaining can.Some paint thinners are not suitable for oil-based finishes.Make sure you use the right kind.
Step 10: Use a wide brush to apply the spray.
A bristle or foam brush is about 2 inches wide.You should brush with the wood grain rather than against it.If you get bubbles, brush them back over.You should apply the diluting one now if you have one of those cans.
Step 11: Allow the first coat to dry and cure.
The brand you are using affects how long this takes.If it is warm, most oil-based finishes will cure overnight.The instructions on the label can take a long time.
Step 12: Sand the first coat.
It would be better to use a power buffer that is at least 280-grit.Again, use a light touch so that you don't sand through it.
Step 13: Dust should be wiped away with a tack cloth.
A tack cloth is a sticky cloth.There is a paint supply store where you can buy one.You can vacuum the dust up if you can't find a tack cloth.It's a good idea to wipe the surface down with a damp cloth.
Step 14: You should apply two coats in the same way.
Sand it smooth after each coat cures.Put a tack cloth on the coat and wipe it clean.
Step 15: To cure completely, allow the final coat to cure.
You can use the wooden piece after the coat cures.All of your furniture and rugs can be moved back if the floor is coated.Continue on to the next section to learn how to get a high-gloss finish on your piece.A high-gloss finish is not recommended for floors.
Step 16: The sand paper should be increased in size to sand the surface.
Move onto a 400 and 600-grit.After using the same method, wipe the surface clean with a cloth dipped in mineral spirits.
Step 17: There is a thin coat of aerosol polyurethane.
For the amount of time recommended on the label, shake the can.Hold it close to the surface and spray on a light coat using a sweeping motion.
Step 18: The coat can be dried and cured.
It should take a couple of hours, but it could take up to a day or two.The coating isn't cured if it feels tacky to the touch.
Step 19: Remove any dust that is necessary.
Take a look at it from an angle if you shine a bright light on the surface.If you see any specks of dust, you'll need to buff them out with 1,500-grit sandpaper.You can use a brown paper bag if you don't have any on hand.
Step 20: The piece can bePolished with a soft cotton cloth or a polishing pad.
Use small, circular motions to go over the entire piece.Continue polishing until you get the shine you want.