Chemical Deglossing
Chemical deglossers are also - cleaners. One of the most important steps to preparing a glossy surface is that it must be clean. Chemical deglossers use strong solvents to soften the underlying paint. They do not work well on oil based paint, and don’t work at all on conversion coatings (found on kitchen cabinets, furniture). They work very well with latex paints. There are both solvent and water based deglossers in the marketplace. The solvent (or non- water based)
Advantages
- Cleans
- Does not create sanding dust
- Works well with latex paints
Disadvantages
- Uses strong solvents
- Must use rubber gloves, good ventilation
- Does not degloss paints other than latex very well
Recommendation
I use deglossers for glossy trim painted in latex semi-gloss. It is easier than sanding in terms of “work”. You just wipe the surface down and your are done (no rinsing , or vacuuming off dust).
Scouring (don't scour on pre-1978 surfaces - see lead paint caution)
The advantage scouring pads have over sandpaper is that they will scrub in conjunction with cleaning solutions better than sandpaper, so you can clean and mechanically degloss in one step. There is no need to use strong solvents with a scouring pad since you will be mechanically deglossing. The cleaning solution works as a lubricant which helps in the scouring process also.
Advantages
- Works with all paints including oil, and conversion coating
- Does a good job cleaning as well as deglossing
- No strong solvents
Disadvantages
- Not the best way to do large surfaces like ceilings and walls
- Can be drippy / messy
- No dry dust , but there is a wet “sludge” created (you must wipe clean with paper towel), the sludge and dip on floors etc…
Recommendation
I use scouring on trim and doors if they are painted in oil (post 1978), and I use a no rinse type of pre-paint cleaner. Use a spray bottle to apply it, scour it, and wipe off with paper towel. No solvent saturated rags and the fire hazard to deal with. No rubber gloves, or strong odors.
Why degloss at all?
Can’t you just use a glossy surface primer and skip the deglossing altogether. You can IF the surface is clean. This is how I prepare pre-1978 surfaces (wash and prime - no sanding or scouring ).
Deglossing will in many cases allow you to skip priming. Special circumstances and higher gloss paints should be deglossed and primed for best adhesion and results.
Please read lead paint warning if your house was built before 1978,
Deglossing
How to Prepare Glossy Surfaces for Paint
part 2
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