Chris Martin
Promoted Users
Hi all,
Making some progress in my airplane painting saga. I have been able to go from awfully orange peel application to now fairly smooth spray (Single Stage, Iwata Kiwamy4, 1.4 tip). As Barry told me when I talked to him it did take a while getting used to this compliant paints and new style of spraying compared to last time I sprayed something 24 years ago! but getting there.
The two problems I still have to solve are what I think you guys call "Urethane Waves" (but not sure. It is not orange peel but small waviness in the otherwise almost glass looking finish) and nibs. Last test panel I sprayed the SS reduced to 25% and will try again with 4:1:1 (20%) and no reduction to see if waves get better. Gun pressure is steady at 29-30 psi. The other possibility is that I am asking too much of the SS and what I have today is good enough (I can be a bit of a perfectiones at times, although I am changing my expectations as I age).
The nibs are driving me crazy though and maybe I can get some ideas from the experts. I spent two months restoring a "moveable" spray booth that was given to me and I am disappointed about the large amount of nibs I am getting. I include a picture of my finished DIY booth. It is nice, has two very good fans but not stellar flow. Intake filters are just 4 plain AC ones (probably too restrictive but I don't get overspray cloud). And I put as much lighting as my pocket could tolerate (my 60 yr old eyes are not as good as they used to).
The problem is that my test panel ends up with too many nibs for the effort put. I have tried a deVilbiss filter at the gun and same. I clean the panel with blue paper obtained from auto paint supply store and SPI waterborne W&G. Then Blue Surgical tack rag. Dust with air. And first coat is always full of nibs. I don't think the second coat is the same. I use an electric blower to try to dust off the booth before painting. I turn off the fans as soon as I finish the coat. Nothing seems to work. The nobs are there as soon as I spray the first coat on.
My suspicion is that the booth is made of wood covered with plastic on the outside. The booth was used on multiple projects in the past. I cleaned the wood as well as I could with damp rags but I suspect old overspray in the wood may be finding its way to my test panel. I could varnish the exposed wood to seal the old overspray but here we go with more work on this one time use booth. The booth is not totally sealed but I am surprised about the large amount of nibs even if some dust finds it's way in.
I know there is probably not much I can do other than finding the source of the contamination but maybe I can get a few good pointers here to try.
Chris
Making some progress in my airplane painting saga. I have been able to go from awfully orange peel application to now fairly smooth spray (Single Stage, Iwata Kiwamy4, 1.4 tip). As Barry told me when I talked to him it did take a while getting used to this compliant paints and new style of spraying compared to last time I sprayed something 24 years ago! but getting there.
The two problems I still have to solve are what I think you guys call "Urethane Waves" (but not sure. It is not orange peel but small waviness in the otherwise almost glass looking finish) and nibs. Last test panel I sprayed the SS reduced to 25% and will try again with 4:1:1 (20%) and no reduction to see if waves get better. Gun pressure is steady at 29-30 psi. The other possibility is that I am asking too much of the SS and what I have today is good enough (I can be a bit of a perfectiones at times, although I am changing my expectations as I age).
The nibs are driving me crazy though and maybe I can get some ideas from the experts. I spent two months restoring a "moveable" spray booth that was given to me and I am disappointed about the large amount of nibs I am getting. I include a picture of my finished DIY booth. It is nice, has two very good fans but not stellar flow. Intake filters are just 4 plain AC ones (probably too restrictive but I don't get overspray cloud). And I put as much lighting as my pocket could tolerate (my 60 yr old eyes are not as good as they used to).
The problem is that my test panel ends up with too many nibs for the effort put. I have tried a deVilbiss filter at the gun and same. I clean the panel with blue paper obtained from auto paint supply store and SPI waterborne W&G. Then Blue Surgical tack rag. Dust with air. And first coat is always full of nibs. I don't think the second coat is the same. I use an electric blower to try to dust off the booth before painting. I turn off the fans as soon as I finish the coat. Nothing seems to work. The nobs are there as soon as I spray the first coat on.
My suspicion is that the booth is made of wood covered with plastic on the outside. The booth was used on multiple projects in the past. I cleaned the wood as well as I could with damp rags but I suspect old overspray in the wood may be finding its way to my test panel. I could varnish the exposed wood to seal the old overspray but here we go with more work on this one time use booth. The booth is not totally sealed but I am surprised about the large amount of nibs even if some dust finds it's way in.
I know there is probably not much I can do other than finding the source of the contamination but maybe I can get a few good pointers here to try.
Chris