It's not so much a case of being dry, since any finish should be dry before
you add another coat. More the way that the poly will cure, and the time
needed for that. With most there is a recoat interval, where the solvent has
evaporated but the curing is at a stage where it will somewhat fuse with
another coat. This interval depends on the product, temperature and other
variables. It's usually specified by the manufacturer. A few do specify
sanding between coats in all cases, either because they are conservative or
perhaps the recoat interval is too short and variable to make use of. If they
do require sanding, only experience with that product can tell you if
recoating will work. If you have the time, you can try with scrap pieces. When
fully cured, sand through the top coat, polish and see if there's a distinct
line between coats. Other tests can be done for adhesion, but this gives you a
good indication.
GerryG

On Mon, 20 Sep 2004 15:04:08 GMT, TWS wrote:

David wrote:

I agree completely with your comments, Mike. I've pressed the
distributor on more than one occasion about skipping sanding. So far,
they won't budge. Personally, I think that one could get by without
sanding if they re-coat at the proper time interval. However, since I'm
counting on them being more familiar with their product's requirements
than I am, I wouldn't take it upon myself to suggest to others that they
deviate from the proscribed schedule.

Another course of action might be for the OP to devote additional time
to testing various methods of application to see what seems to work
well. The only fly in the ointment being that finish failures may not
manifest themselves upon immediate observation.

David


I am not sure but I think the reason for the scruff sanding is based on
the recommendation that WB Poly needs to completely dry before the next
coat or you will get moisture trapped under the upper coats with cloudy
results. If the base hardens then the scruff sand will be necessary to
get the best bond.

TWS