Can I Spray Lacquer Over Polyurethane

You cannot put anything catalyzed poly urethane etc over lacquer bc the lacquer has no catalyst therefore will be reflowed when the hot reducers catalyst hits itresulting in a list of potential problems. Ive sprayed lacquer over shellac without difficulty. You can usually use shellac as a buffer coat between any two finishes. You got it backwards. Sound like a decent fix. Coating over an old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the amount of work involved. If I were you I wouldnt even waste my time sanding.

Also Know how do you protect a lacquer.

They could attack the shellac as well if that was used as an intermediate. But I wouldnt use a polyurethane varnish due to concerns about how well it will adhere. On your point on removing the tape before it fully kicks man on man are you right on. As Tonar mentioned you can shoot poly OVER lacquer. I feel more comfortable recoating a piece with lacquer than polyurethane. Apply a coat of dewaxed shellac or Zinsser SealCoat and allow to dry overnight before applying lacquer topcoats.

Spraying Lacquer Over Oil Based Polyurethane Woodworking Blog Videos Plans How To

Can i spray lacquer over polyurethane. I could spray shellack for the first few light coats for a even better adhesion then lacquer. Also Know how do you protect a lacquer. I never sprayed shellack but read that it can take lacquer well and sticks to de-glossed poly.

It will add resistance to spills and a bit of resistance to scratching. My experience is with lacquer only with great results. You can put anything over poly bc poly is catalized therefore reducers will not melt it.

Jim I can not imagine a problem with spraying lacquer over urethane I dont believe there is a compatibility issue at all. Stupid mistake - polyurethane and lacquer Poly over lacquer is ok lacquer over poly wont work because the thinners are to hot and they will melt the poly. That will work but lacquer over oil will result in an alligator finish.

Sound like a decent fix. If I were you I wouldnt even waste my time sanding. Of course you need to test in a inconspicuous place to be sure.

Polyurethane is a more durable coating. Instead use an alkyd varnish. The barrier has to be wax free shellac.

I feel more comfortable recoating a piece with lacquer than polyurethane. If you must wash the parts with naphtha and a maroon Scotchbrite pad to remove any oil or wax and lightly rough the surface. Second polyurethane is not the best choice for painting over lacquer finishes.

An example is alkyd oil base over lacquer. Does anyone out there know if pre-cat lacquer can be sprayed on top of acrylic polyurethane.

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You cannot put anything catalyzed poly urethane etc over lacquer bc the lacquer has no catalyst therefore will be reflowed when the hot reducers catalyst hits itresulting in a list of potential problems.

But I wouldnt use a polyurethane varnish due to concerns about how well it will adhere. The safest thing to do is to use dewaxed shellac over the poly and then you can go to the lacquer without worry. Stupid mistake - polyurethane and lacquer Poly over lacquer is ok lacquer over poly wont work because the thinners are to hot and they will melt the poly. An example is alkyd oil base over lacquer. On your point on removing the tape before it fully kicks man on man are you right on. Instead use an alkyd varnish. But a non-polyurethane varnish would have better properties that. Correspondingly can lacquer be sprayed over polyurethane. Coating over an old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the amount of work involved.

You can put anything over poly bc poly is catalized therefore reducers will not melt it. But applying a finish over an existing finish is one of the riskiest operations you can do in finishing because it can result in any number of problems. I could spray shellack for the first few light coats for a even better adhesion then lacquer. I picked some Zinsser brand up today actually. Even if it has varnish on it its so old hard and dry you can get away with putting lacquer over it as long as you dont flood a wet coat on it. Polyurethane will not bond or grip well with the lacquer and will peel off over time with general use. On your point on removing the tape before it fully kicks man on man are you right on.