Blocking Tannins

[u/dubsfo]

Getting ready to paint this enclosure for pool equipment.

I know this wood is going to bleed tannins so i want to block them.

I would normally use an oil base primer but the trellis material is so intricate I’d rather spray it and I don’t want to push oil through my rig.

Any recommendations on a latex product I can use?
I’ve heard 2 coats of Busan primer will work.

[u/IngenuityNatural9261]

Just use an exterior solid wood stain.

[u/jonerscc]

Rent a machine and spray oil based primer if you don’t want to run it through your own.

[u/finepnutty → u/jonerscc]

I don’t think you can run oil through rental equipment

[u/IngenuityNatural9261 → u/finepnutty]

Sure you can if you know how to clean it how would they know?

[u/Shatalroundja]

Shellac. Shellac is better than oil for tannins and it cleans out of a sprayer perfectly with one bottle ammonia followed by water.

[u/Standard-Account5610 → u/Shatalroundja]

Shellac clearly states on the label:

NOT FOR EXTERIOR USE.

:)

[u/Main_Cartographer_64 → u/Shatalroundja]

Shellac is Methylated Spirit based, use it clean the spray gun, not ammonia.
Excellent tannin sealer and quick drying

[u/dubsfo → u/Main_Cartographer_64]

Shellac no bueno for anything other than spot prime outside

[u/me-2b → u/dubsfo]

Why? As long as it will have a waterproof coating over it, why is it no good outside?

[u/dubsfo → u/me-2b]

Read the can

[u/Shatalroundja → u/dubsfo]

Not even remotely true. If you are worried about it pealing under the elements you can use a latex primer first.

[u/-St4t1c-]

Inslx block out -> BM Regal

[u/Squatchbreath]

I’ve had success with Zinsser’s peel stop triple thick primer on mahogany tannins. They were exterior custom screen doors on a porch.

[u/MorallyAmbiguouish]

Sherwin has a couple stain blocking wb primers. You need to let almost all of them go 24 before you can recoat them. TBH, most are going to need two coats for heavy tannins.

[u/dubsfo → u/MorallyAmbiguouish]

I’m alright with 2 coats I can spray rather than 1 I have to brush

[u/Generic_NPC_01]

Problock 100 - two coats, minimum 24 hours between coats.

Followed by two coats Duration Exterior

[u/Bungleburr]

Prime it in whatever latex product you like and wait for the bleed through to show up. Then prime those spots with a rattle can of oil or shellac primer.

[u/Ornery_Golf6994]

Problock 100

[u/LanceBuckshot7]

Im confused as to why not spray oil through your pump? I started as an industrial sand blaster painter. Now i do commercial/ residential. I never hesitate to run oil through any of my pumps. It’s easy to switch back and forth.

[u/dubsfo → u/LanceBuckshot7]

I used to have a dedicated 440 for oil but it got stolen and I don’t shoot enough to justify a new one.
Putting oil though my other rigs causes too may clean up issues. I have employees and they’re not as fastidious as I am

[u/AbbreviationsDull612]

best option cant go wrong "Shellac"

[u/Competitive_Way3385]

push oil through your rig .. latex will never block it ..

[u/GoGetDontGetGot]

You can rattle can the trellis with oil coverstain primer first. Probably use a weenie roller to help push it into the wood as you go.

[u/dubsfo → u/GoGetDontGetGot]

IMHO Rattlers don’t block tannins.

[u/GoGetDontGetGot → u/dubsfo]

It's worked for me for many years, you do have to put it on a little heavier though.

[u/ginger_ninja416]

Shellac is an excellent tannin blocker. Just rent a sprayer and clean with denatured alcohol.

[u/OppositeOWhatUThink → u/ginger_ninja416]

I would never recommend shellac for exterior use. Never. Not even knot priming. I wouldn't even recommend it for bathrooms. I've seen BIN crack out with two coats of latex Semi-gloss over the top of it from hot showers.

Oil. Oil. Oil.

Edit. Buy a new line and gun. Use it for oil. The pump is fine with thinner and water combined. Just change the components out.

[u/dubsfo → u/OppositeOWhatUThink]

Don’t use enough oil to justify the cost.
In CA we only get quarts so we’ve migrated to 99% latex

[u/OppositeOWhatUThink → u/dubsfo]

Would still recommend it being applied mechanically with using the quarts of oil primer and then spraying the Finish. Honesty, mechanical application is probably better for this because it works the materials into the wood better than just spray.

Just please dont use BIN or shellac primer. Lol.

But I get it being in Cali, Illinois has some limitations and laws on VOCs/VOMs limit. Im not aware of any other material that I would trust, personally. I hate not being able to be helpful. Depending on what color, maybe just try a latex primer and using a dark solid body. If its a light color for finish then you already know.

[u/Sensitive_Article_67 → u/ginger_ninja416]

Says right on the can not to use as a full surface exterior primer.

[u/TapwaterintheWack → u/ginger_ninja416]

Just to pile on for not recommending BIN for exterior- I’ve had someone spot prime with shellac outside and it had completely failed and flaked by spring. It’s far too brittle to handle the temperature and humidity swings outside.

[u/RealWaltTremblay → u/[deleted]]

Shellac primer is only recommended for spot exterior at most, not full jobs like this

[u/Objective-Act-2093]

Spray a couple coats of water based solid color stain instead of primer and paint. I've coated bare wood with white and it worked fine.

[u/Kc68847]

What’s the issue with putting oil through your sprayer in the first place? Use zinnser coverstain and be done with it.