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Pre-cat over shellac primer

2/18/16       
Mike Member

I started a job using the Bin alcohol based shellac primer (red can) on a couple of sheets of MDF and now i have to shift gears and use a different top coat then planed. The top coat will be Sherwin Williams pre-cat lacquer and the primer for that will be the sher-wood pre-cat primer surfacer E63W30. Can i put the new primer over the old primer? If the consensuses goes back and forth i will just buy new sheets.
Problem # 2 I will also be buying the 4x8 sheets of MDF beaded panel for the wall area but I'm pretty sure that comes with a factory primer already on it and the same question as above but i don't have any idea what the factory primer is. The solid wood beaded boards don't have a good depth of detail that's why i want to use the mdf sheet product. Any thoughts?

2/18/16       #2: Pre-cat over shellac primer ...
Charles Member

Re: #2. The beaded MDF panels that my supplier has are not primed. The entire finishing process is under my control. Check with multiple suppliers if necessary to find what you want.

2/18/16       #3: Pre-cat over shellac primer ...
Jim Conklin  Member

Website: http://www.jhconklin.net

Give the pre-cat primer a try over the BIN. If you are thinking to replace the sheets anyway, what's to lose?

Trial it thru the full finish schedule.

We use the Sealcoat purified shellac as a barrier layer all the time under pre-cat clear sealer with no problem unless we go heavy on the first sealer coat.

We did some vanities that the cab shop had installed pre-primed beadboard from one of the box stores (think H-me Dep-t)

The factory primer crinkled under our lacquer primer - Valspar pre-catalyzed sanding sealer tinted grey. We sanded the crap outta them and laid down successive piss coats before a flow coat to insulate the factory primer. It worked, but was in and out of the booth 3 more times than expected.

Now, when asked to quote such stuff, I put in a caveat upcharge for the 'unknown' behavior of pre-primed stock.

2/19/16       #4: Pre-cat over shellac primer ...
RobertJ

Sealcote works for me! 45.00 per gallon.

2/21/16       #5: Pre-cat over shellac primer ...
Kit Mosden  Member

Website: mosdens.com

Be careful with Sealcote under water based finishes. It is supposed to be fully compatible but sometimes the chemistry that gives it a long shelf life causes problems. I always make up my own dewaxed shellac and don't have problems.


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