Stained cupboard doors
Help – please. I don’t know what to do?
There have been multiple posts regarding similar issues and the solution is always to use a different base of paint to block out the stain. So, if you used a water based paint switch to an oil-based one and visa versa.
The reason it didn’t happen on the inside is very likely because they have not been stained?
Use an oil-based undercoat to cover the stripe; leave for a week and then emulsion over it. If it’s only a small area you could use a stain-block aerosol which will be easier and you could to paint over it the next day.
Sounds like the mahogany stain is migrating via the primer and undercoat? If you used oil-based paints then switch to water based and if you used water-based then switch to oil; the stain will be one or the other.
Just to complicate matters, if you have used oil-based and now need to use water-based you’ll find it doesn’t adhere very well to oil based paints that have recently been applied. If this is the case you’ll need to leave it a couple of weeks for the paint to fully cure.
If you need to sue an oil-based finish it’s ok to use 2 coats of water-based primer/undercoat just to kill the staining first.
Wood contaminated with dog pee
I think the best option would be a standard oil-based wood primer which will seal the surface and prevent any possible staining? With MDF especially, you will probably need to give 2 coats (both thinned 10% with white spirit).
Use an oil-based undercoat and top coat to finish. If you want to use a water-based finish I’d suggest waiting a week to allow the primer to fully cure before application.