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Applying two different finishes on exterior wood door6/9
Is it an acceptable or common practice to use two different finishes on an exterior wood door? I would like to use a spar varnish on exterior of the door and something I'm more familiar with on the interior, probably MLC Krystal. Using a product like MLC EuroX on a single door seems cost prohibitive at around $300 for material alone. It is probably important to mention that we do very little exterior work.
You should use the same finish schedule on all surfaces of the door. It is similar to applying a veneer to a substrate. You need to balance the panel. Use your exterior finish on the inside face of the door also. There are products that can be formulated in both solid colour and clear. If you want a stain on the exterior and solid colour on the interior, use one of those. We use a product called D-dur. I think it's manufactured by Chemcraft.
I've done it. Lots of people do it. I can remember seeing lots and lots of doors that are painted on the outside and stained/cleared on the inside.
I've done a spanish cedar door that had Target EM9300 on the exterior and MLC Resistant on the interior. Never had an issue.
I naturally think like you, Mike, because we build most of the components we finish and I know how wood panels move. But what also seems to be true is that an exterior door can never be truly balanced because the environment is so different on either side of the door. Just trying to break thru my analysis paralysis.
I've done the painted outside, clear inside. Never had an issue. As long as each of the coatings seals the wood it shouldn't matter.
Think of it like a table top. You can seal the bottom with 1 coat of shellac and spray 10 coats of 2K poly on the top. It will not warp.
More coats or a different product will make no difference.
Many people use different polish on the doors. It is completely normal. Since exterior is the one that catches attention of people we use expensive polish on the exterior but on the interior many use polishes at a lower rate because only people staying the the home notice that. Here is a blog with a few tips for people polishing wood doors, since you are going to do that it may be of help to you: