You are better off letting the paint cure fully and sand the runs out then reapply the base coat and topcoat. DO NOT wipe them from the substrate when wet as this could end up really affecting the final finish. Small paint blobs drip down the surface and end in a teardrop in the paint (called runs). If you are too close when you spray, you will run the risk of paint runs. Your thumb tip to your little finger when your hand is outstretched is usually a good distance to keep in mind. You should be able to sand this back and reapply for a much smoother finish. This will leave a grainy feel on the top surface. If you spray too far away from the substrate you are painting, the paint will atomise and dry before it actually hits the substrate. The better the can, the better the finish. The distribution from the aerosol can itself also play a big part in the finish. You may also notice poorer quality paint will react easily with a number of common substrates. The old adage “you get what you pay for”, is no truer than with paint! Poor quality paint can play a role in any poor finishes you notice in your work. If the last coat you laid is nice and flat with no imperfections, then continue with the job as normal and lay your next coat. Although it can sometimes provide you with a flatter coat, it is not always necessary. A barrier paint should be strong enough to mask and protect the base coat from any colour underneath.Īnother common misconception is that you must sand the paint between coats. The only way to eradicate this is to sand the substrate back completely, or you can invest in a barrier paint. This can cause an instant paint reaction, or it can occur over time once dried. Should this occur you will need to sand back until the surface is flat, and then reapply the paint leaving more time for each coat to cure.Īnother possibility is a paint reaction with different paints, you may find different chemical properties. If the first coat cures at a slower pace underneath the second coat, then it may shrink the top surface which can then cause cracking. This leaves a crackled effect on the top surface, or sometimes hairline cracks can appear reminiscent to a spider web.Ī problem that you could face, is that if you apply the second coat before the first has fully cured, then you may find that the second coat dries faster. Should this occur, sand the primer back and clean any particulate off the surface, then reapply the primer in thinner layers.Ĭracking or webbing normally appears when there is a paint reaction or if the first coat of paint hasn’t dried before the second coat is applied (regardless whether its primer, base coat or topcoat). This is because you have applied the primer to thickly, or the first coat has not had the time to fully cure before applying the second coat. When you apply primer, you may notice small pinholes in the paintwork. Seek advice from the paint supplier on drying times or ask for the Technical Data Sheets (TDS) that all good paint manufacturers can supply on request. Giving yourself time between coats is very important as not all paints will dry within 15 minutes (a common misconception). Rushed paintwork is the biggest contributor to the poorest finishes. ![]() One of the most significant and most important factors in spray painting is making sure you have, and give, enough time between coats. Here are some of the most common faults and misconceptions of spray painting. However,there are a range of common misconceptions that cause people to apply paint in the wrong manner, making the effort put into the application a waste of time. ![]() When it comes to applying spray paint, there are many things that you need to take into consideration.
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