Latex primer over oil primer?

Is it ok to do a 2nd coat of latex primer over a first coat of oil primer? (exterior)

 

Yes, you can go over oil primer with latex primer and/or latex paint. Is there a reason you need a 2nd coat of primer?

 

That's a good question... is one coat usually good enough for new exterior wood?

The case for a second coat is for underneath our porch where I have primed some raw wood joists (also pretty rough cut sides as some of it is very old wood) and for which we are NOT planning to paint over. We are just trying to add some weather protection for non-exposed areas. Is this a good plan? and do we want a 2nd coat?

Also, there are some rafter tails (paritally exposed) that we have that are going to have to go the rainy winter without being painted. We have put one coat of oil primer on these. Will that provide adequate protection until we can paint in early spring? Or should we hit w/ 2nd coat too (very hard to do mind you) or what?

Thanks!

 

Unless you are painting over cedar or redwood [or any wood subject to tannin bleed] I wouldn't bother with a 2nd coat of primer. If anything it would be wise to put 1 coat of finish paint over the primed wood. Primer can take some weather but after months of exposure, it will probably need repriming.

 

The areas you "don't want to paint" but have primed need a coat of paint not more primer.Primer is missing ingredients that paint have to resist weathering mildew etc.Primers are dead flat which will hold dirt.Instead of priming again it needs real paint.

If you are waiting to paint these areas because of color concerns etc top coat with a mid grade white house paint and you'll be able to easily cover it later.As for the areas not seen you would have been better off to skip primer and use paint to protect those areas.