Author Topic: Minwax Acrylic Polyurethane (Read 1843 times)

Kirm Dog · « **on:** March 07, 2006, 06:59:35 AM »

I just tried the Minwax Poly on a test piece of balsa and had some startling results. The grain was raised so bad that I question weather I did something wrong. I had sanded with 320 grit paper then applied the Poly with a brush. I was going to use this to stick down some carbon mat but I think I will stick to dope.
Anybody else ever have this problem with Acrylic Poly? Should I try sanding again and apply a second coat?

Don Kirmess

Russell Shaffer · « **Reply #1 on:** March 07, 2006, 07:03:38 AM »

Is it the water based variety? That would explain the grain. Russell

Kirm Dog · « **Reply #2 on:** March 07, 2006, 07:40:21 AM »

Yes it is water based.

Bill Little · « **Reply #3 on:** March 07, 2006, 10:48:43 AM »

Hi Don,
I would sand it with 320 or so and hit it with another coat. That should make it smooth and sealed. Hit it with the 320 or 400 when the second coat is cured and apply your CF!

Kirm Dog · « **Reply #4 on:** March 07, 2006, 06:03:38 PM »

Thanks Bill, I'll give it a try.

Don

phil c · « **Reply #5 on:** March 08, 2006, 11:16:27 AM »

you can save yourself a lot of sanding by putting on 2-3 coats before sanding. Usually by the third coat the film has pretty well developed and you can sand it smooth without going through. If you sand through the film, it opens the wood up to more grain raising on the next coat.

L0U CRANE · « **Reply #6 on:** March 12, 2006, 02:52:54 PM »

I'd heard that the poly material can be quite heavy. Thinning it 2 or 3 to 1 with rubbing alcohol makes coats lighter, reportedly, and isopropyl evaporates quicker than water.

That may spare some of the grain rise, and keep each coat lighter.

Did I mistake what I think I'd heard?

john e. holliday · « **Reply #7 on:** March 19, 2006, 07:05:40 PM »

My experience with water base Poly-Urethane is to sand after the first coat has cured for at least a day. It soaks into the wood and makes it stiffer/harder. Then it does not take so much on second coat. DOC Holliday

Author Topic: Minwax Acrylic Polyurethane (Read 1843 times)

Kirm Dog

Minwax Acrylic Polyurethane

Russell Shaffer

Re: Minwax Acrylic Polyurethane

Kirm Dog

Re: Minwax Acrylic Polyurethane

Bill Little

Re: Minwax Acrylic Polyurethane

Kirm Dog

Re: Minwax Acrylic Polyurethane

phil c

Re: Minwax Acrylic Polyurethane

L0U CRANE

Re: Minwax Acrylic Polyurethane

john e. holliday

Re: Minwax Acrylic Polyurethane