[aalbert77]

DIFFERENCE between Zinsser Oil and Alkyd-water based Primers by comparing the Product Overview at homedepot.com:

Oil-based formula provides excellent adhesion to ***ALL*** surfaces without sanding.
Water-based formula sticks to ***MOST*** surfaces without requiring sanding.
Conclusion: Oil penetrates and sticks better

Oil Ideal for tannin rich wood, blocks and seals tannin bleed
Alkyd: Nothing stated
Conclusion: Oil better for redwood

Oil: 2 hr dry -
Alkyd: 30 min dry
Conclusion: oil advantage for not shrinking and cracking


Reason that oil only in quarts is to comply with EPA rules.

I will use oil based to prime a previously stained redwood handrail.

 

[Holland]

DIFFERENCE between Zinsser Oil and Alkyd-water based Primers by comparing the Product Overview at homedepot.com:

Oil-based formula provides excellent adhesion to ***ALL*** surfaces without sanding.
Water-based formula sticks to ***MOST*** surfaces without requiring sanding.
Conclusion: Oil penetrates and sticks better

Oil Ideal for tannin rich wood, blocks and seals tannin bleed
Alkyd: Nothing stated
Conclusion: Oil better for redwood

Oil: 2 hr dry -
Alkyd: 30 min dry
Conclusion: oil advantage for not shrinking and cracking


Reason that oil only in quarts is to comply with EPA rules


I will use oil based to prime a previously stained redwood handrail.

Just to clarify... which Oil and which Alkyd primers are you referring to?

Oil (or BIN -for spot or interior) definitely where tannins and stains may be problematic.

Coverstain can be topcoated in 20 minutes on a dry day, and will still block Tannins.

I find that '123' is a primer that levels-out (probably due to the added polypropylene glycol) which makes it a good primer (where applicable) when a smoother finish is desired.

Many on here will advocate for Zinnser's BIN Primer, as an excellent all around spot primer and interior primer.

 

[Lightningboy65]

I find that '123' is a primer that levels-out (probably due to the added polypropylene glycol) which makes it a good primer (where applicable) when a smoother finish is desired.

Many on here will advocate for Zinnser's BIN Primer, as an excellent all around spot primer and interior primer.

While 123 is a great primer for many applications, it is not very sanding friendly. In my book that property rules it out as a good candidate where a smooth finish is desired. As far as a primer that results in a fairly smooth finish without sanding, I agree that 123 does fill that need.....

But BIN followed up by a quick sanding.......dat da' bomb!!!