643 primer eats sandpaper without catalyst

[brok3artist]

Noticed that when using the 643 as a 1K (without catalyst), it doesnt sand nearly as well, I end up burning through a lot more sandpaper. It doesnt clog the paper, but it kills it after just 2doors. I've tried various SurfPrep pads and papers, but nothing lasts. Thoughts??

 

[spraytechguru]

Absolutely, using the 643 as a 1K without a catalyst does wear out sandpaper more quickly. Without that catalyst, the sanding process isn't as effective, which causes the paper to heat up and wear down faster, even if it's not getting clogged. You might want to try a coarser grit or switch to a more durable paper made for high-friction sanding. Also, double-check your sanding technique to ensure you're not putting too much pressure on the paper, as that can shorten its lifespan too. I hope this helps

 

[izzy&co]

@spraytechguru Yeah, I noticed the same. Catalyst really changes how it cuts. I guess without it, the stuff just smears and chews paper fast. Anyway, OP you're not crazy at all. Thats normal. Takes time to get to the right method tho.

 

[brok3artist]

Absolutely, using the 643 as a 1K without a catalyst does wear out sandpaper more quickly. Without that catalyst, the sanding process isn't as effective, which causes the paper to heat up and wear down faster, even if it's not getting clogged. You might want to try a coarser grit or switch to a more durable paper made for high-friction sanding. Also, double-check your sanding technique to ensure you're not putting too much pressure on the paper, as that can shorten its lifespan too. I hope this helps

That makes sense... thanks for the insight! I didnt realize the lack of catalyst would make that much difference in heat and wear. Ive been using medium grit, so i'll definitely try a coarser one next time. Do you have a specific brand or type of sandpaper you've had good luck with for high-friction sanding like this?