Pro-Spray clearcoat time

H

HVAC Phil

I was planning on using the Pro-Spray base under the SPI UC. I was looking over the data sheet and it says clear must be applied within 8 hrs of base. For those who have used pro-spray, is this time line that critical? Let's say i apply my base, finish at 4pm saturday. Would i be ok applying my clearcoat by 9-11am sunday? I plan on shooting viper blue metallic base with SPI universal clear, all under SPI subtrates, epoxy, sealer, etc. As recommended by Chad, will use all SPI reducers with the base.

Phil
 
i'm not sure why they say that. if it's true then i'm screwed :) i wait 24 or longer on most anything .
 
Yep it states it right on the tech sheet. I found it odd as most bases give up to 24hrs to clear.

Shine-Have you ever had any issues waiting 24hrs to clear?
 
i've seen some changes in other tech sheets about this.....with sikkens, metallic colors are 48 hrs...solid colors are 5 hrs....to extend solid color to 48 hrs add 5% hardnener.

honestly...been using this system for 7 years now and have never seen any problems extending those times. some of these custom jobs, some of the layers can be on there 3-4 days. what i try to do if it sits a while, is go over it with a thin coat of clear base before applying clear...it will bite into the older base just fine....atleast thats what sikkens tells me...or just apply another coat of base.
 
I'd like to know more about this, as far as I thought I knew, hardener shortened the window, not lengthened it. I wonder if these recommendations are more about the manufacturer not being able to control conditions than it is about anything chemical going on in the base...?
 
Hardener will leave the base open longer. Waiting longer on base is fine. You gotta remember the tech sheets are meant for production shops to get The stuff out as fast as possible without having issues. They are not written for the best way....just the most productive. I dont know about prospray but i have let hok and rm sit for as long as 3 weeks.
 
Longest I have ever waited was on a 40' trailer, that was a little over a month.
Wait over night all the time.
 
Chad.S;7032 said:
Longest I have ever waited was on a 40' trailer, that was a little over a month.
Wait over night all the time.
Click to expand...

That's what i was looking for. Now to get a material list together.
 
Is there any benefit to waiting over night? I usually base and then clear a few hours later.
 
orangejuiced86;7611 said:
Is there any benefit to waiting over night? I usually base and then clear a few hours later.
Click to expand...

the longer the base sits.. the better the gloss retenetion the clear will have..
 
I remembered this thread after reading the prospray tech sheet today. The tech sheet says to clear within 1 hour if base is activated, 8 if not activated. Wouldn't that mean that activator speeds the cure?

The reason I'm asking, is I want to know how many hours I HAVE to wait for maximum gloss retention and clarity. If it has to be over night, then that is what I will do. If I could get the same resullts 6 or 8 hours later, that would be a lot more convenient for me.

P.S. It is hot here... 75 metal temp in the morning, and 80s by noon.
 
honestly speaking I personally don't pay much attention to those tech sheets. and don't hand them out on purpose. I think they could do more harm than good sometimes.
 
I sprayed a test bumper today and cleared about 4 hours after base. It looks great! I'm very happy with the base I got from you, Chad.
 
ok, i'm painting in a hot garage.... by 11 it's too hot to stand.

what would be a better plan?

first way: Spray prospray base on one day, Universal clear the next morning
second way: Spray base and one coat of clear the first day, and then three more the next day
 
i would spray the base one day the clear the next morning. sounds like a good plan to me..


Glad you liked it strum!!!
 
wow, that makes my life a lot easier. here I thought I had to do it all in the same day because of that dang one hour window (because I'm activating it)

Why do they say one hour when you can actually wait 24 hours? wouldn't it be less confusing to say "1 to 24 hours"?
 
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