sherwin clear
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does anyone use sherwin williams 757 clear? i just switched to it from the 939 and am having trouble with how its laying out. im using a 4000rp 1.4 tip wide open 25ish psi, 90 degrees or so with the 55 and 56 reducers depending on the job size. anyway let me know if anyone is spraying this and how its going. thanks!
I use the same gun same tip size. The 55 reducer is too fast for 90 degrees. I don’t imagine you can bring the temp below 80? The 757 has the highest solid content of all the SW low voc clears, so it does take a little more effort to lay it down.
You may want to try the 755 clear, it is slower than the 757 and should work a lot better for you at such high temps.
How fast are you able to nib and buff it? They want me getting any nibs out before it goes back to reassembly. SW says surface temp has to be 140 degrees for 20 min then a 20-30 min cool down and it ready to go. I have found it is not even close to that fast. I can buff in he afternoon if I paint in the morning, but anything painted afternoon needs to sit for the night before I can get on it.
[quote=”nearl4″ post=32062]How fast are you able to nib and buff it? They want me getting any nibs out before it goes back to reassembly. SW says surface temp has to be 140 degrees for 20 min then a 20-30 min cool down and it ready to go. I have found it is not even close to that fast. I can buff in he afternoon if I paint in the morning, but anything painted afternoon needs to sit for the night before I can get on it.[/quote]
The 757 can be buffed about an hour after bake…if your booth performs well. You need 140 degrees metal temp for 20 minutes. In my booth, that equaled a minimum 35 minutes baking. There are faster clears, that may work better for you. The HPC 21 I can easily denib after 30 minutes air dry. Mixing the 21 with the 755, I can bake for 15 minutes, then polish right after cool down.
Lots if other options for clears if the 757 isn’t performing the way you want.
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