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dolphins
Clean Up Our Oceans
Premium Member
join:2001-08-22
Westville, NJ

dolphins to robbin

Premium Member

to robbin

Re: diluting oil based polyurethane

said by robbin:

It was applied properly. It wasn't latex modified. The problem seemed to be that unless the painter was diligent in continuing to stir the poly frequently it would start separating and as the thinner rose to the surface you were painting with a higher diluted product and the thinner it was the less the gloss. The poly with the Penetrol in it didn't have his problem as well as just handling better overall.
Were you using a water based poly?

robbin
Mod
join:2000-09-21
Leander, TX

robbin

Mod

said by dolphins:

Were you using a water based poly?
No -- I was using Glidden Porch & Floor Polyurethane Oil Gloss.

»www.duspec.com/datasheet ··· atasheet

Note -- in the data sheet it states "Do not thin".

It was hard finding information regarding adding Penetrol but found the following

"To Improve Varnish Work
Add 20 to 30% Penetrol Wood Oil to all oil and alkyd based varnish
as well as 1-part polyurethanes. The varnish will become more flexible,
resist cracking and peeling and will flow without leaving brush marks.
NOT SUITABLE IN 2-PART POLYURETHANES OR EPOXIES."

»floodaustralia.net/broch ··· doil.pdf

I rarely ever thin oil based paint, preferring the workability of Penetrol but until I found the above I was uncertain if it could be added to Polyurethane. Penetrol is not a thinner -- it is a conditioner.