reducing 2k primer to use as a guide coat

S

ShaunD

how much would you folks suggest reducing 2k spi primer to use as a guide coat. i am spraying grey spi 2k for blocking and I am using the buff spi 2k primer as a guide coat. how much should i thin it to use as a guide coat. i dont want to be sanding for hours to get a thick coat of buff 2k off the car but I dont want to over reduce it and end up creating me more problems. suggestions! being a rookie i am very happy that i have found this site as most other boards seem to give conflicting advise and in some cases incorrect advise. you guys are awesome thanks for your help!
 
If you mean a different color primer as a guide coat, I would look at 100-125%, just need a mist spray.
 
yup i am using the grey spi 2k for build and using the spi 2k buff for guide coat. the first round of blocking i didn't reduce the guide coat and put it on like normal primer and it took me all day to sand it off at 150 grit! it came out nice and straight but wow i literally had 8 hours worth of sanding with 150 grit. needless to say moving to 320 grit i would need to sand for 2 days! I will reduce 100-125% for the guide coat. thanks for the advice
 
Shaun dont waste good 2k like that in my opinion..

Buy some lacquer primer.. Barry sells it..

Reduce it 200% with reducer or lacquer thinner.. Doesnt matter.. Then mist it over the 2k.. It will last forever and ever..

Ive had 2 gallons of the stuff for sooooooo many years.. One red oxide, the other grey
 
It's personal preference for some but I've missed scratches with the dry guidecoat no matter how heavy it was applied or how hard I pushed when applying. It does have some uses like the first cut on primer but when switching grits from say 320 or 400 to a final sand of 600-that's when it's bit me and I know now when not to use it.
 
Bob Hollinshead;9514 said:
It's personal preference for some but I've missed scratches with the dry guidecoat no matter how heavy it was applied or how hard I pushed when applying. It does have some uses like the first cut on primer but when switching grits from say 320 or 400 to a final sand of 600-that's when it's bit me and I know now when not to use it.
Click to expand...

So are you using the lacquer primer too?
I have been using the 3M dry for a while with good success but I did notice a couple of scratches that I missed recently. Just figured it was these old eyes of mine. LOL
 
I found that with the dry stuff it seemed to clog up the fine paper too easy. It's like it is pulled out of some scratches or something. I have gotten where I have it, but don't use it often. I can normally get by with just going by the gloss on the epoxy primer. I love the way it lays down smooth and glossy.

Aaron
 
The "el-cheapo" lacquer in a spray can sold at Wal-Mart works as good as
anything I've used. Just make sure it's the one labeled "sandable"
they sand off much easier.
It's much easier than mixing up something else and it's only a couple
bucks a can. I have the 3m dry and use that when I don't want to spray
something, like when I remove all the masking and have forgotten to guide coat it (LOL)
 
Ditto on the spray cans;).
Left over urethane base, over reduced, works good for guide coat. I like black or something dark on the SPI grey.
 
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