Satin oil based / water based issue

[Lucky30]

Hi all, I've done all the skirting and architrave in my house using real wood pine. After much reading about water vs oil satinwood, I opted for oil based.

My process was sand the wood lightly, prime with bin primer, light sand and prime again. Then 2 coats of leyland satinwood oil based which Looked great at first.

A few months down the line and it's gone a slight yellow color

For downstairs I've done the same process but used leyland water based satin and the result is perfect and it apparently won't yellow.

So, I am going to re paint all upstairs but my question is.. do I need to prime the old oil based paint with bin primer before using water based satin, or can I just go straight onto it? My fear is, if I don't prime it that the yellowing will seep through and make the water based paint go yellow too.

Huge thanks in advance

 

[Robbie uk]

The yellow wont seep through, but ideally use Zinnser Coverstain as an adhesion primer instead of the BIN. Its oil based but better. Dries in an hour too.

 

[Lucky30]

Thank you, So I can just go straight onto it with the waterbased satin? I've done a tester bit, seems fine..

 

[Robbie uk]

Yeah it works great !

 

[Lucky30]

Thanks for your help, so just to confirm.. I can paint it with the water based satin , without using any primer or anything first?thanks

 

[misterhelpful]

No.
Robbie has suggested using Coverstain, as a bridging primer, which will adhere directly to the oil based satin. If you don't use this, or some other high grip primer, you are likely to have adhesion issues which may not be noticeable immediately, but any bumps or scrapes further down the line will easily scratch the water based paint off. If you want to paint without an adhesion promoting primer, you will need to sand the sheen off the existing oil-based satin, to avoid this sort of problem.

 

[Lucky30]

No.
Robbie has suggested using Coverstain, as a bridging primer, which will adhere directly to the oil based satin. If you don't use this, or some other high grip primer, you are likely to have adhesion issues which may not be noticeable immediately, but any bumps or scrapes further down the line will easily scratch the water based paint off. If you want to paint without an adhesion promoting primer, you will need to sand the sheen off the existing oil-based satin, to avoid this sort of problem.

Right, I misunderstood sorry. I've already gone over some of it without primer, it looks great but now I've got more issues of it falling off to look forward to then

 

[misterhelpful]

Right, I misunderstood sorry. I've already gone over some of it without primer, it looks great but now I've got more issues of it falling off to look forward to then

You might be lucky enough to get away with it but, for guaranteed longevity, sanding is highly recommended.

 

[Lucky30]

You might be lucky enough to get away with it but, for guaranteed longevity, sanding is highly recommended.

it looks great for now at least, but I've got some of that primer mentioned above now so will use that for the rest.

If using that primer , do I still need to sand?

thanks guys

 

[misterhelpful]

Theoretically, there's no need to sand, but being 'old school', I always gave it a very light sand, if only to de-nib any imperfections.

 

[Lucky30]

Theoretically, there's no need to sand, but being 'old school', I always gave it a very light sand, if only to de-nib any imperfections.

I gave it a quick sand and primed. so just 2 coats of the water based satin to finish up now - thanks guys