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1. On the left I sprayed a really thick lacquer with too little air strain, which brought about extreme orange peel. I cleared this up on the suitable by thinning the lacquer and growing the air strain.
These are along with the spray gun being out of tune.
I’ve written beforehand about issues brought on by your spray gun. Just as a result of your gun is tuned effectively doesn’t essentially imply you’ll at all times get good outcomes. Other issues can go improper. Here are 5 of the most typical.
Orange Peel
The huge one, after all, is orange peel. It’s not doable to utterly keep away from this flaw, however it’s doable to return so shut that the defect isn’t noticeable.
Orange peel can happen with any end and is normally brought on by spraying too thick a liquid with too little air strain. When acknowledged this manner, the answer is clear: skinny the liquid or improve the air strain.
If you’re utilizing a twig gun with air equipped by a turbine reasonably than a compressor, you received’t have a lot management of air strain; you’ll in all probability should skinny the liquid.
Another reason behind orange peel is holding the gun too removed from the floor or transferring the gun so quick you don’t deposit a completely moist coat. The greatest solution to decide the correct distance and velocity is to look at what’s occurring in a mirrored mild.
By arranging lighting and positioning your self so you’ll be able to see a mirrored image on the floor you’re spraying, you will notice when the end isn’t happening correctly. Then you can also make the required adjustment.
Dry Spray
2. To present what dry spray is, I added some acetone to my lacquer to hurry the drying and sprayed it onto the panel at a low angle. The left aspect seems to be and feels sandy.
Dry spray is overspray that settles on the floor after the droplets of end have dried within the air. Dry spray produces a sandy appear and feel and happens mostly on the edges of a twig sample when the end is drying too quick. It additionally happens when the end bounces off the floor after which settles again onto it after each the end and the bounce again have begun to dry.
Dry spray happens solely with fast-drying finishes and is particularly prone to occur when spraying the insides of cupboards, containers and drawers the place there’s extra bounce again and turbulence.
The apparent remedy for dry spray is to gradual the drying of the end by including a retarder—that’s, a slower evaporating thinner. Because the finishes that dry the quickest skinny with lacquer thinner, the suitable retarder is lacquer retarder.
Lacquer retarder will also be used with shellac if you wish to gradual its drying. Xylene will be added to conversion varnish to gradual its drying.
Don’t add extra retarder than obligatory, nevertheless, or you might lengthen the drying time a lot that the end will acquire mud and present press marks for hours and even days.
Blushing
3. Fast-drying finishes resembling lacquer and shellac “blush,” or flip milky white when sprayed in humid climate. To stop this you must gradual the drying by including lacquer retarder.
Blushing is a spraying drawback as a result of it solely happens with fast-drying finishes that skinny with lacquer thinner or alcohol. Blushing doesn’t happen with varnishes or water-based finishes which can be brushed.
The milky whiteness of blushing is brought on by moisture within the air condensing into the end after which, upon evaporation, leaving air voids that refract the sunshine and stop it from touring by way of the end. The discoloration is almost definitely to happen, after all, in humid climate.
Conversion varnish not often blushes, and oil-based varnish, polyurethane and water-based end by no means blush (although water-based end can flip considerably opaque if utilized very thick).
To keep away from blushing in lacquer and shellac, add lacquer retarder to the end earlier than making use of it. The retarder slows the drying course of so the end can nonetheless pack down and eradicate the air voids after the moisture has evaporated.
The draw back of including retarder is that it slows the general drying of the end, which slows your manufacturing and will result in mud issues, runs and press marks. For this motive, don’t add extra retarder than is required to keep away from the blushing.
If you get blushing and it doesn’t come out by itself inside a few hours, spray some retarder (as little as doable to clear up the end) onto the floor to “open up” the end and permit it to pack down strong and eradicate the voids. Spraying common lacquer thinner (or alcohol onto shellac) may work on a drier day. You can even rub the end with metal wool or an abrasive pad to take away the end nearest to the floor, the place the blushing happens.
Finish Doesn’t Harden
4. If you gradual the drying an excessive amount of, or in case your store is chilly, the end received’t harden within the regular time, and it’ll mark when one thing (like my finger on this case) is pressed towards it.
There are two causes for the end not hardening inside a standard timeframe. The first is that you’ve added lacquer retarder to unravel one of many issues described above. The second and most typical is that you simply’re working in a chilly atmosphere. Either manner, the end will present pressmarks simply.
Cold temperatures gradual the drying of any end. Only finishes that skinny with lacquer thinner will be adjusted to dry usually in these circumstances. The solution to do it’s so as to add a little bit “fast” or “hot” lacquer thinner to the end to get it to dry quicker. These lacquer thinners are normally obtainable from auto-body provide shops. You can even add acetone, which is extensively obtainable. If you reside in an space that complies with strict VOC legal guidelines, you’ll be able to change to 275 VOC lacquer, which is made with quite a lot of acetone.
Poorly Coated Edges
5. A typical drawback when ending cupboard doorways just isn’t getting a thick sufficient end on the sides. Especially below sinks, this can lead to the end peeling lengthy earlier than it ought to.
Not getting sufficient end on the sides of cupboard doorways leads inevitably to peeling, particularly below sinks. Inadequate construct on edges is a spraying drawback as a result of it not often occurs when brushing a end.
You should be absolutely conscious of the issue to keep away from it, however when you’re conscious, avoidance is straightforward. It’s only a matter of spraying full coats of end onto the sides, holding your spray gun at a straight-on angle.
Many finishers maintain the spray gun at a 45° angle when spraying edges and this doesn’t deposit sufficient end. The finish consumer will start to expertise issues inside a number of years.
Product Recommendations
Here are some provides and instruments we discover important in our on a regular basis work across the store. We could obtain a fee from gross sales referred by our hyperlinks; nevertheless, we now have fastidiously chosen these merchandise for his or her usefulness and high quality.
