Painting over DIY Kitchens 2K PU finish - I messed up

[usualstreets]

Couldn't stomach the £1.8k to have a custom colour on our kitchen with DIY Kitchens and now need to repaint it (using estate eggshell from F&B)...

I have already severely messed up and didn't sand or prime the doors I painted over the weekend and as you can see in the first image, there's no strength in the bond - my fingernail peels the paint right off...

I have tried a sample patch (just one coat) after sanding with 180 grit and this seems to be a lot better already (second image after scratching with fingernail).

My Questions:

1. Could only sanding be sufficient to get the emulsion to bond to the 2k PU units?
2. If not, what is the best primer to bridge the gap between the PU and emulsion topcoat? My reasearch has led me to Zinsser BIN being best..
3. Could I just use the primer and no sanding or should it be both?

Any advice hugely appreciated before I dig and even deeper hole...

 

[Wayners]

I know someone that uses Teknos Aqua Futura primer.
I also know someone that uses Benjamin moore stix.
I myself have use Zinsser BIN Aqua.
Probably many more products that will act as a adhesion primer.

 

[michealangelo]

Couldn't stomach the £1.8k to have a custom colour on our kitchen with DIY Kitchens and now need to repaint it (using estate eggshell from F&B)...

I have already severely messed up and didn't sand or prime the doors I painted over the weekend and as you can see in the first image, there's no strength in the bond - my fingernail peels the paint right off...

View attachment 373332

I have tried a sample patch (just one coat) after sanding with 180 grit and this seems to be a lot better already (second image after scratching with fingernail).

View attachment 373333

My Questions:

1. Could only sanding be sufficient to get the emulsion to bond to the 2k PU units?
2. If not, what is the best primer to bridge the gap between the PU and emulsion topcoat? My reasearch has led me to Zinsser BIN being best..
3. Could I just use the primer and no sanding or should it be both?

Any advice hugely appreciated before I dig and even deeper hole...

Good adhesion primer such as PX4 , PX3 from crown , Bedec All Prime, Dulux Grip

I think a light pressured rub with a soft synthetic moulding abrasive pad will be better than any sort of sanding abrasive ....too much pressure and you will scratch the surface and leave lines that may not be covered, even after an undercoat or a few topcoats

After gentle rubbing clean down the surface then apply your primer

I would tend to use crown PX4 as it hardens off well

Two coats of that will give you a good base to decorate on and ensure your top coats stick

Bear in mind that although some paints say no undercoat needed, just 2 finishing coats it's generally a good idea to undercoat on top of your primer coats if that's what the paint system suggests ....before your top coats

 

[usualstreets]

Appreciate the sound advice michealangelo. PX4 sounds like it'll do just the job

Just had a response from DIY Kitchens for anyone else ever doing this route:

"
- The surface should be properly keyed before painting.

- Lightly sand the surface, being careful not to leave any scratches. It’s best to finish off with a light Scotch Brite pad.

- You can use any paint system, but make sure to research the durability of the products you choose. For reference, we use a PU primer, and our paint is an acid-lacquered polyurethane paint."

 

[michealangelo]

Appreciate the sound advice michealangelo. PX4 sounds like it'll do just the job

Just had a response from DIY Kitchens for anyone else ever doing this route:

"
- The surface should be properly keyed before painting.

- Lightly sand the surface, being careful not to leave any scratches. It’s best to finish off with a light Scotch Brite pad.

- You can use any paint system, but make sure to research the durability of the products you choose. For reference, we use a PU primer, and our paint is an acid-lacquered polyurethane paint."

Those sponges that your mum or nan uses to do the dishes ....sponge one side , green soft scrub the other side ....those with a bit of fairy liquid and few drops of water .....just buff over the surface .....clean off with clean sponge

That's the key they need

Then your chosen primer on top .....PX4 , Zinser Bin red , etc

 

[michealangelo]

Avern - Robert Scott Basic Sponge Scourers 10 Pack

Buy super absorbent Robert Scott basics sponge scourers 10 pack from Avern Industrial Cleaning Supplies. From pubs and restaurants to home, we serve all. Next Day Delivery Available

www.averncleaningsupplies.com

These , fairy liquid , water , good clean of surface

All over clean rag or sponge

Once fully dry prime

I use this approach for a lot of surfaces that are in fairly good shape , in my view using a decent grip primer means excessive sanding is not really needed unless the surface is nibby or very shiny......and then , even with a grip primer it is best to give tge surface a more detailed abrade

 

[usualstreets]

Great, thanks!