A glossy surface may look clean and still carry grease or polish that stops new paint gripping. It can also hide weak layers underneath. Putting a different finish on top does not fix those problems. Check the condition, clean thoroughly and choose a preparation method that suits both the old coating and the paint going over it.
Check the old finish first
Look for flaking edges, cracks, bubbles and soft patches. A coat that is already lifting needs attention; do not gouge sound paint simply to test it. Find the cause of any failure, whether it is damp, movement, damage or poor adhesion between old coats. Before scraping or sanding older paint, consider lead. If it is suspected, get competent advice about safe preparation.
Clean before sanding
Wash away grease, polish and dirt with a suitable cleaner. Kitchen doors, skirting boards, handrails and door edges can be more contaminated than they look. Follow the cleaner’s instructions, rinse where required and allow the surface to dry. Sanding a greasy surface can spread contamination rather than remove it.
Dull the sheen without destroying the surface
Where the new paint system calls for sanding, use a suitable abrasive to dull the shine without leaving deep scratches. Smooth chips and runs, taking care around mouldings and edges. The aim is to give the new coating a suitable surface, not remove every sound layer. Some adhesion primers have different preparation requirements, so read their instructions rather than assuming every glossy surface needs the same treatment. Remove sanding dust before painting.
Use the right primer or undercoat
A suitable adhesion primer can help a new finish grip sound gloss, but it must be compatible with the old coating, the material underneath and the topcoat. Bare wood, filler and stains may need separate treatment. Follow the specified drying and recoating times. If the combination is uncertain, make a small test patch and use the manufacturer’s advice on assessing adhesion; a quick scratch while the paint is still soft tells you very little.
Woodwork paint can feel dry while it is still soft underneath. Follow the product’s drying and hardening instructions, avoid pressing freshly painted surfaces together and leave cleaning until the finish is ready for it.
Apply the finish without overworking it
Use a paint rated for the surface and the level of wear it will receive. Keep coats even and do not keep brushing or rolling once the finish has started to tack. Thin edges help prevent sticking on doors and windows. Remove rough specks with light sanding between coats only when the product instructions allow it, then remove dust before recoating.
When is professional preparation sensible?
A sound door or a short length of skirting can be a manageable DIY job. Loose coatings, many layers of paint, detailed mouldings or a whole house of woodwork take more preparation. If the cause of peeling is unclear, get it assessed before repeating the same job. The interior painting service covers doors, frames, skirting and other painted woodwork.
Gloss-paint FAQs
Can I paint straight over gloss?
It is risky. Clean the surface, check that the old coating is sound, dull the sheen and use a compatible primer where the product system requires one.
Do I need to remove all old gloss?
Not always. Sound old gloss can often be prepared in place, but loose, cracked or failing paint needs to be removed and the cause addressed.
Can I use water-based paint over solvent-based gloss?
Sometimes, but compatibility and adhesion must be checked. Follow the primer and finish manufacturer’s instructions.